CN102750735B - Method and system for simulating atmosphere - Google Patents
Method and system for simulating atmosphere Download PDFInfo
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- CN102750735B CN102750735B CN201110249755.1A CN201110249755A CN102750735B CN 102750735 B CN102750735 B CN 102750735B CN 201110249755 A CN201110249755 A CN 201110249755A CN 102750735 B CN102750735 B CN 102750735B
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Abstract
The embodiment of the invention discloses a method and system for simulating the atmosphere. The method comprises the following steps: the initial color of a collection point in the atmosphere is obtained; a color factor is generated according to an RGB (red green blue) value of the initial color; a first intersection point and a second intersection point are obtained; a color imitating factor is generated according to a point of sight, the collection point, the first intersection point and the second intersection point; the imitated color of the collection point is generated according to the initial color, the color factor and the color imitating factor; and the imitated color is filled in the collection point. According to the embodiment of the invention, the imitated color is generated by calculating the color imitating factor of the atmosphere collection point in a geography atmosphere model, the color of the atmosphere is simulated efficiently in real time, and a better rendering effect is obtained.
Description
Technical field
The present invention relates to virtual three-dimensional earth field, more particularly, to a kind of method and system of simulated atmosphere layer.
Background technology
Atmosphere is atmospheric thermodynamics again, and the earth is just surrounded by the very thick atmosphere of this layer.Atmospheric composition mainly has
Nitrogen, accounts for 78.1%；Oxygen accounts for 20.9%；Argon accounts for 0.93%；Also has a small amount of carbon dioxide, rare gas (helium, neon
Gas, argon, Krypton, xenon, radon gas) and vapor.Atmospheric atmospheric density reduces with height, and higher air is thinner.
Atmospheric thickness is about more than 1000 kms, but does not have obvious boundary.
Atmospheric simulation is critically important to virtual three-dimensional earth system, and existing more conventional atmosphere analogy method is to make
With Rayleigh scattering model and MIE scattering model.1871, Rayleigh through repeatedly studying, on the basis of repeatedly calculating it is proposed that
Famous Rayleigh scattering formula, when light incides in uneven medium, such as emulsion, colloid solution etc., medium is just because of folding
Rate of penetrating is uneven and produces scattered light.Rayleigh research shows, even if uniform dielectric, due to molecule particle ceaselessly heat fortune in medium
Dynamic, destroy the position relationship of intermolecular fixation, thus also producing a kind of molecular scattering, here it is Rayleigh scattering.Rayleigh passes through
Calculating is thought, the intensity of molecular scattering light is relevant with the frequency (or wavelength) of incident illumination, i.e. the Rayleigh's law of bipyramid.High noon
When, sun direct projection earth surface, when through atmosphere, the light of various wavelength is subjected to the scattering of air, wherein to sunlight
Longer wavelengths of scattering of wave is less, and major part travels on ground.And the shorter indigo plant of wavelength, green glow, it is stronger by air scattering,
The color of its aerial blueness exactly these scattered light, therefore sky can assume blueness.
During realizing the present invention, inventor finds to suffer from the drawback that in prior art：
Method comparison is complicated, computationally intensive, high to system performance requirements, and real-time implementation is difficult.
Content of the invention
Embodiments provide a kind of method and system of simulated atmosphere layer it is achieved that when atmosphere is simulated, calculating
Method is simple, amount of calculation is little, not high to system performance requirements, and the simulation that can manage in fact, and rendering effect is good.
Embodiments provide a kind of method of simulated atmosphere layer, comprise the following steps：
Obtain the priming color of the collection point in atmosphere；
Rgb value according to described priming color generates color factor；
It is the according to the farthest intersection point that described first tangent line formed with described atmosphere is obtained by the first tangent line of viewpoint
One intersection point, is the second intersection point according to obtaining described second tangent line with atmospheric point of contact by the second tangent line of described viewpoint, its
Described in the first tangent line tangent with the earth, described second tangent line is tangent with atmosphere；
Color modelling factors are generated according to described viewpoint, described collection point, described first intersection point and described second intersection point；
Generate the simulation face of described collection point according to described priming color, described color factor and described color modelling factors
Color；
Described analog color is filled to described collection point.
The described rgb value according to described priming color generates color factor, specifically includes：
Obtain the largest component value of described rgb value of described priming color and minimum component value；
Color factor is calculated according to described largest component value and described minimum component value.
Also include, when described endoatmosphere, described viewpoint is as the second intersection point for described viewpoint.
Described according to described viewpoint, described collection point, described first intersection point and described second intersection point generate color simulation because
Son, specifically includes：
According to connecting the line segment of described viewpoint and described first intersection point, be connected the line segment of described viewpoint and described second intersection point
Generate the Color influences factor with connecting the line segment that described viewpoint is with described collection point；
Color modelling factors are calculated according to the described Color influences factor.
What the technical scheme of the embodiment of the present invention was brought has the beneficial effect that：By calculating geographical Atmospheric models mesosphere
The color modelling factors of collection point, generate analog color it is achieved that high efficiency, real-time Simulation atmosphere color, and have relatively
Good rendering effect.
Embodiments provide a kind of system of simulated atmosphere layer, including：
Priming color acquiring unit, for obtaining the priming color of the collection point in atmosphere；
Color factor signal generating unit, generates color factor for the rgb value according to described priming color；
Intersection point acquiring unit, for obtaining described first tangent line and described atmosphere shape according to by the first tangent line of viewpoint
The farthest intersection point becoming is the first intersection point, cuts with atmospheric according to obtaining described second tangent line by the second tangent line of described viewpoint
Point is the second intersection point, and wherein said first tangent line is tangent with the earth, and described second tangent line is tangent with atmosphere；
Color modelling factors signal generating unit, for according to described viewpoint, described collection point, described first intersection point and described
Two intersection points generate color modelling factors；
Analog color signal generating unit, for according to described priming color, described color factor and described color modelling factors
Generate the analog color of described collection point；
Color filling unit, for filling described analog color to described collection point.
Described color factor signal generating unit, specifically includes：
Component value obtains subelement, and the largest component value for obtaining the described rgb value of described priming color is divided with minimum
Value；
Color factor computation subunit, for according to described largest component value and described minimum component value calculate color because
Son.
Also include, when described endoatmosphere, described viewpoint is as the second intersection point for described viewpoint.
Described color modelling factors unit, specifically includes：
The Color influences factor generates subelement, for according to connecting the line segment of described viewpoint and described first intersection point, be connected
The line segment of described viewpoint and described second intersection point and be connected described viewpoint and generate the Color influences factor with the line segment of described collection point；
Color modelling factors computation subunit, for calculating color modelling factors according to the described Color influences factor.
What the technical scheme of the embodiment of the present invention was brought has the beneficial effect that：By calculating geographical Atmospheric models mesosphere
The color modelling factors of collection point, generate analog color it is achieved that high efficiency, real-time Simulation atmosphere color, and have relatively
Good rendering effect.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, also may be used
So that other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of method flow diagram of simulated atmosphere layer in the embodiment of the present invention；
Fig. 2 is a kind of method particular flow sheet of simulated atmosphere layer in the embodiment of the present invention；
Fig. 3 is a kind of system construction drawing of simulated atmosphere layer in the embodiment of the present invention；
Fig. 4 is a kind of system concrete structure diagram of simulated atmosphere layer in the embodiment of the present invention；
Fig. 5 is a kind of schematic diagram of the method and system of simulated atmosphere layer in the embodiment of the present invention；
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment a part of embodiment that is the present invention, rather than whole embodiments.Based on this
Embodiment in bright, the every other enforcement that those of ordinary skill in the art are obtained under the premise of not making creative work
Example, broadly falls into the scope of protection of the invention.
The embodiment of the present invention one provides a kind of method of simulated atmosphere layer, as shown in figure 1, comprising the following steps：
Step S101, obtains the priming color of the collection point in atmosphere.
Step S102, the rgb value according to described priming color generates color factor, specifically includes：Obtain described initial face
The largest component value of the described rgb value of color and minimum component value；Calculated according to described largest component value and described minimum component value
Color factor.
Step S103, farthest with what described atmosphere was formed according to described first tangent line is obtained by the first tangent line of viewpoint
Intersection point is the first intersection point, is second according to obtaining described second tangent line with atmospheric point of contact by the second tangent line of described viewpoint
Intersection point, wherein said first tangent line is tangent with the earth, and described second tangent line is tangent with atmosphere.
Step S104, generates color mould according to described viewpoint, described collection point, described first intersection point and described second intersection point
Quasi-factor, specifically includes：According to connecting the line segment of described viewpoint and described first intersection point, be connected described viewpoint and described second and hand over
The line segment of point and the line segment generation Color influences factor connecting described viewpoint and described collection point；According to the described Color influences factor
Calculate color modelling factors.
Step S105, generates described collection according to described priming color, described color factor and described color modelling factors
The analog color of point.
Step S106, described analog color is filled to described collection point, and is filled out according to the analog color of described collection point
Fill the described atmosphere of refreshing.
Also include, when described endoatmosphere, described viewpoint is as the second intersection point for described viewpoint.
What the technical scheme of the embodiment of the present invention was brought has the beneficial effect that：By calculating geographical Atmospheric models mesosphere
The color modelling factors of collection point, generate analog color it is achieved that high efficiency, real-time Simulation atmosphere color, and have relatively
Good rendering effect.
The embodiment of the present invention two provides a kind of method of simulated atmosphere layer, as shown in Fig. 2 comprising the following steps：
Step S201, sets up earth atmosphere layer model by pre-defined rule, as shown in Figure 5.
Step S202, obtains the priming color of collection point P in atmosphere, is designated as colorP.
Step S203, the priming color colorP according to described collection point P generates color factor, specific as follows.
Obtain the largest component value of described rgb value of described priming color and minimum component value, that is, the R of described rgb value, G,
B value, in the present embodiment, largest component value is colorP.b=255, and minimum component value is colorP.r=72.
Color factor m, such as formula (1) are calculated according to described largest component value and minimum component value：
M=colorP.b/colorP.r (1)
Try to achieve m=3.54.
Step S204, according to the tangent line through viewpoint E and the earth, obtains described tangent line farthest with what described atmosphere was formed
Intersection point A is the first intersection point, is the second intersection point according to obtaining point of contact B through described viewpoint and atmospheric tangent line.
Step S205, generates face according to described viewpoint E, described collection point P, described first intersection point A and described second intersection points B
Color modelling factors n, specifically includes：Line segment EA, described viewpoint E and described second according to described viewpoint E and described first intersection point A
The line segment EB of intersection points B and described viewpoint E generate Color influences factor of n with the line segment EP of described collection point P；According to described color shadow
Ring factor of n and calculate color modelling factors k.Concrete such as formula (2) and formula (3)：
N=(EB-EP)/(EB-EA) (2)
K=n*n (3)
Particularly, when described viewpoint E is in endoatmosphere, second point of B is viewpoint itself, i.e. line segment EB=0, now face
Color factor of influence n=EP/EA.
Step S206, generates according to described priming color colorP, described color factor m and described color modelling factors k
Analog color colorP (i) of described collection point P, such as formula (4)：
ColorP (i)=m*k*colorP (4)
Step S207, described analog color colorP (i) is filled to described collection point P.
Step S208, points all to described atmosphere are acquired analog color and refresh described atmosphere, realize air
The simulation of layer.
What the technical scheme of the embodiment of the present invention was brought has the beneficial effect that：By calculating geographical Atmospheric models mesosphere
The color modelling factors of collection point, generate analog color it is achieved that high efficiency, real-time Simulation atmosphere color, and have relatively
Good rendering effect.
The embodiment of the present invention three provides a kind of system of simulated atmosphere layer, as shown in figure 3, including：
Priming color acquiring unit 301, for obtaining the priming color of the collection point in atmosphere；
Color factor signal generating unit 302, generates color factor for the rgb value according to described priming color, specifically for
Obtain the largest component value of described rgb value of described priming color and minimum component value；According to described largest component value and described
Minimum component value calculates color factor；
Intersection point acquiring unit 303, for obtaining described first tangent line and described air according to by the first tangent line of viewpoint
The farthest intersection point that layer is formed is the first intersection point, obtains described second tangent line and atmosphere according to by the second tangent line of described viewpoint
Point of contact be the second intersection point, wherein said first tangent line is tangent with the earth, and described second tangent line is tangent with atmosphere；
Color modelling factors signal generating unit 304, for according to described viewpoint, described collection point, described first intersection point and institute
State the second intersection point and generate color modelling factors, specifically include：For according to connect described viewpoint and described first intersection point line segment,
Connect the line segment of described viewpoint and described second intersection point and be connected described viewpoint and generate Color influences with the line segment of described collection point
The factor；Color modelling factors are calculated according to the described Color influences factor；
Analog color signal generating unit 305, for according to described priming color, described color factor and described color simulation because
Son generates the analog color of described collection point；
Color filling unit 306, for filling described analog color to described collection point.
What the technical scheme of the embodiment of the present invention was brought has the beneficial effect that：By calculating geographical Atmospheric models mesosphere
The color modelling factors of collection point, generate analog color it is achieved that high efficiency, real-time Simulation atmosphere color, and have relatively
Good rendering effect.
The embodiment of the present invention four provides a kind of system of simulated atmosphere layer, as shown in figure 4, including：
Priming color acquiring unit 401, for obtaining the priming color of the collection point in atmosphere；
Color factor signal generating unit 402, generates color factor for the rgb value according to described priming color；
Intersection point acquiring unit 403, for obtaining described first tangent line and described air according to by the first tangent line of viewpoint
The farthest intersection point that layer is formed is the first intersection point, obtains described second tangent line and atmosphere according to by the second tangent line of described viewpoint
Point of contact be the second intersection point, wherein said first tangent line is tangent with the earth, and described second tangent line is tangent with atmosphere；
Color modelling factors signal generating unit 404, for according to described viewpoint, described collection point, described first intersection point and institute
State the second intersection point and generate color modelling factors；
Analog color signal generating unit 405, for according to described priming color, described color factor and described color simulation because
Son generates the analog color of described collection point；
Color filling unit 406, for filling described analog color to described collection point.
Described color factor signal generating unit 402, specifically includes：
Component value obtains subelement 4021, for obtaining the largest component value and of the described rgb value of described priming color
Small component value；
Color factor computation subunit 4022, for calculating color according to described largest component value and described minimum component value
The factor.
Described color modelling factors unit 404, specifically includes：
The Color influences factor generates subelement 4041, for according to connect described viewpoint and described first intersection point line segment,
Connect the line segment of described viewpoint and described second intersection point and be connected described viewpoint and generate Color influences with the line segment of described collection point
The factor；
Color modelling factors computation subunit 4042, for calculating color modelling factors according to the described Color influences factor.
Also include, when described endoatmosphere, described viewpoint is as the second intersection point for described viewpoint.
What the technical scheme of the embodiment of the present invention was brought has the beneficial effect that：By calculating geographical Atmospheric models mesosphere
The color modelling factors of collection point, generate analog color it is achieved that high efficiency, real-time Simulation atmosphere color, and have relatively
Good rendering effect.
Through the above description of the embodiments, those skilled in the art can be understood that the present invention can be led to
Cross hardware to realize it is also possible to can realize by the mode of software plus necessary general hardware platform, based on such understanding, this
The technical scheme of invention can be embodied in the form of software product, and this software product can be stored in one and non-volatile deposit
Storage media (can be CD-ROM, USB flash disk, portable hard drive etc.) in, including some instructions with so that a computer equipment is (permissible
Be personal computer, server, or the network equipment etc.) method described in execution each embodiment of the present invention.
In a word, the foregoing is only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.
All any modification, equivalent substitution and improvement within the spirit and principles in the present invention, made etc., should be included in the present invention's
Within protection domain.
Claims (4)
1. a kind of method of simulated atmosphere layer, sets up earth atmosphere layer model by pre-defined rule it is characterised in that including following walking
Suddenly：
Obtain the priming color of the collection point in atmosphere；
Rgb value according to described priming color generates color factor, specially：Obtain the described rgb value of described priming color
Largest component value and minimum component value, calculate color factor according to formula one；
It is the first friendship according to described first tangent line is obtained with the farthest intersection point of described atmosphere formation by the first tangent line of viewpoint
Point, is the second intersection point according to obtaining described second tangent line with atmospheric point of contact by the second tangent line of described viewpoint, wherein institute
State the first tangent line tangent with the earth, described second tangent line is tangent with atmosphere；
Using formula two and formula three, generated according to described viewpoint, described collection point, described first intersection point and described second intersection point
Color modelling factors；
Using formula four, generate described collection point according to described priming color, described color factor and described color modelling factors
Analog color；
Described analog color is filled to described collection point；
Described formula one is：M=colorP.b/colorP.r, wherein colorP.b are largest component value, and colorP.r is minimum
Component value, m is described color factor；
Described formula two is：N=(EB-EP)/(EB-EA), wherein EA are the connecting line segment of described viewpoint and described first intersection point,
EB is the connecting line segment of described viewpoint and described second intersection point, and EP is the connecting line segment of described viewpoint and described collection point, and n makes a living
The Color influences factor becoming；
Described formula three is：K=n*n, wherein k are color modelling factors；
Described formula four is：ColorP (i)=m*k*colorP, wherein colorP (i) are analog color, and colorP is described first
Beginning color.
2. as claimed in claim 1 a kind of method of simulated atmosphere layer it is characterised in that described viewpoint is in described endoatmosphere
When, described viewpoint is as the second intersection point.
3. a kind of system of simulated atmosphere layer is it is characterised in that include：
Priming color acquiring unit, for obtaining the priming color of the collection point in atmosphere；
Color factor signal generating unit, generates color factor for the rgb value according to described priming color, specially：Component value obtains
Subelement is taken to obtain the largest component value of described rgb value of described priming color and minimum component value, it is single that color factor calculates son
Unit calculates color factor according to formula one；
Intersection point acquiring unit, for obtaining described first tangent line and described atmosphere formation according to by the first tangent line of viewpoint
Farthest intersection point is the first intersection point, according to obtaining described second tangent line by the second tangent line of described viewpoint with atmospheric point of contact is
Second intersection point, wherein said first tangent line is tangent with the earth, and described second tangent line is tangent with atmosphere；
Color modelling factors signal generating unit, specifically includes：The Color influences factor generates subelement, for generating face according to formula two
Color factor of influence；Color modelling factors computation subunit, for generating color modelling factors according to according to formula three；
Analog color signal generating unit, for using formula four, according to described priming color, described color factor and described color mould
Quasi-factor generates the analog color of described collection point；
Color filling unit, for filling described analog color to described collection point；
Described formula one is：M=colorP.b/colorP.r, wherein colorP.b are largest component value, and colorP.r is minimum
Component value, m is described color factor；
Described formula two is：N=(EB-EP)/(EB-EA), wherein EA are the connecting line segment of described viewpoint and described first intersection point,
EB is the connecting line segment of described viewpoint and described second intersection point, and EP is the connecting line segment of described viewpoint and described collection point, and n makes a living
The Color influences factor becoming；
Described formula three is：K=n*n, wherein k are color modelling factors；
Described formula four is：ColorP (i)=m*k*colorP, wherein colorP (i) are analog color, and colorP is described first
Beginning color.
4. as claimed in claim 3 a kind of system of simulated atmosphere layer it is characterised in that described viewpoint is in described endoatmosphere
When, described viewpoint is as the second intersection point.
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| CN1677444A (en) * | 2005-02-01 | 2005-10-05 | 珠海金山软件股份有限公司 | Realp-time 3-D image processing device |
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| CN1404019A (en) * | 2002-10-23 | 2003-03-19 | 北京航空航天大学 | Method of creating vivid lighting effect under virtual environment several factor effects |
| CN1677444A (en) * | 2005-02-01 | 2005-10-05 | 珠海金山软件股份有限公司 | Realp-time 3-D image processing device |
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Effective date of registration: 20211220 Address after: 100195 room 104, floor 1, building 1, courtyard 131, West Fourth Ring North Road, Haidian District, Beijing Patentee after: Beijing Jinsong Chuangyi Technology Co.,Ltd. Address before: 100195 new technology building, 49 Wukesong Road, Haidian District, Beijing Patentee before: China Digital Video (Beijing) Co.,Ltd. |