CN104574495A - Method and device for rendering image - Google Patents
Method and device for rendering image Download PDFInfo
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- CN104574495A CN104574495A CN201410805582.0A CN201410805582A CN104574495A CN 104574495 A CN104574495 A CN 104574495A CN 201410805582 A CN201410805582 A CN 201410805582A CN 104574495 A CN104574495 A CN 104574495A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T15/00—3D [Three Dimensional] image rendering
- G06T15/50—Lighting effects
- G06T15/60—Shadow generation
Abstract
The invention discloses a method and device for rendering an image. The method comprises the following steps: determining a vertex lighting value of each pixel point of an image to be rendered, and an included angle between the lighting direction of each pixel point and the vertex normal direction; extracting a brightness template value of each pixel point from a preset lighting change template according to the value of the included angle between the lighting direction of each pixel point and the vertex normal direction; multiplying the difference, which is obtained by subtracting the vertex lighting value of each pixel point from the brightness template value of each pixel point, by a preset brightness adjustment coefficient, and then adding the vertex lighting value of the pixel point to obtain a final lighting value after the brightness is adjusted, and rendering the image according to the final lighting value. Through the method and the device for rendering the image, the image is more real, and the display effect is more three-dimensional.
Description
Technical field
The present invention relates to technical field of information processing, particularly relate to a kind of image rendering method and device.
Background technology
Along with the development of digital processing device, the game based on digital processing device have also been obtained and develops rapidly.Games Software usually relates to a large amount of image processing operations, such as, carries out image rendering to the character etc. in game picture.Image rendering usually needs to consume a large amount of messaging resources, and the messaging resource of the mobile digital treatment facilities such as such as mobile phone is limited, therefore, needs to save messaging resource when carrying out image rendering as far as possible.
At present, mobile digital treatment facility generally carries out image rendering by per-vertex lighting method.Particularly:
Mobile digital treatment facility by per-vertex lighting formula, calculates the per-vertex lighting value on each aspect of actor model, then directly described per-vertex lighting value is carried out role as the final illumination value of actor model plays up.
Although carry out image rendering by per-vertex lighting method can save messaging resource, because the actor model obtained lacks illumination variation, therefore picture is true not, and display effect is three-dimensional not.
Summary of the invention
In view of this, the present invention proposes a kind of image rendering method and device, can make that picture is more true, display effect is more three-dimensional.
The technical scheme that the present invention proposes is:
A kind of image rendering method, the method comprises:
Determine the angle in the per-vertex lighting value of each pixel of image to be rendered and the direction of illumination of each pixel and vertex normal direction;
According to the value of described direction of illumination and vertex normal angular separation, from the brightness stencil value of each pixel of illumination variation template extraction preset;
The difference brightness stencil value of each pixel being deducted the per-vertex lighting value gained of this pixel is multiplied by default brightness adjustment coefficient, and then add the per-vertex lighting value of this pixel, be adjusted the final illumination value of brightness, carry out image rendering according to described final illumination value.
A kind of image rendering device, this device comprises illumination and angle determination module, gets look module and adjusting module;
Described illumination and angle determination module, for the direction of illumination of per-vertex lighting value and each pixel of determining each pixel of image to be rendered and the angle in vertex normal direction;
Describedly get look module, for the value according to described direction of illumination and vertex normal angular separation, from the brightness stencil value of each pixel of illumination variation template extraction preset;
Described adjusting module, difference for the per-vertex lighting value gained brightness stencil value of each pixel being deducted this pixel is multiplied by default brightness adjustment coefficient, and then add the per-vertex lighting value of this pixel, be adjusted the final illumination value of brightness, carry out image rendering according to described final illumination value.
As seen from the above technical solution, first the embodiment of the present invention determines the per-vertex lighting value of each pixel, but with in prior art directly according to described per-vertex lighting value carry out image rendering unlike, the embodiment of the present invention determines the direction of illumination of each pixel and the angle in vertex normal direction further, and according to the value of described angle from the illumination variation template extraction brightness stencil value preset, lay the grain degree of illuminating is raised on the basis of described per-vertex lighting value according to described brightness stencil value, final illumination value according to have adjusted brightness carries out image rendering, therefore, thus make the illumination variation of the picture rendered distincter, picture is truer, display effect is more three-dimensional.
Accompanying drawing explanation
Fig. 1 is the image rendering method process flow diagram that the embodiment of the present invention provides.
Fig. 2 is the schematic diagram of the brightness change template that the embodiment of the present invention provides.
Fig. 3 is the image rendering apparatus structure schematic diagram that the embodiment of the present invention provides.
Embodiment
Fig. 1 is the image rendering method process flow diagram that the embodiment of the present invention provides.
As shown in Figure 1, this flow process comprises:
Step 101, determines the angle in the per-vertex lighting value of each pixel of image to be rendered and the direction of illumination of each pixel and vertex normal direction.
Wherein, the per-vertex lighting value on each summit can be calculated according to formula I=Ambient+Diffuse* (LightDirNormalDir), wherein, I is per-vertex lighting value, Ambient represents environment illumination value, Diffuse represents diffusion illumination value, * represent and be multiplied, LightDir represents direction of illumination, NormalDir represents vertex normal direction, (LightDirNormalDir) be the dot-product of LightDir and NormalDir, this dot-product represents the size of the direction of illumination on summit and the angle in vertex normal direction.
Step 102, according to the value of described direction of illumination and vertex normal angular separation, from the brightness stencil value of each pixel of illumination variation template extraction preset.
Step 103, the difference brightness stencil value of each pixel being deducted the per-vertex lighting value gained of this pixel is multiplied by default brightness adjustment coefficient, and then add the per-vertex lighting value of this pixel, be adjusted the final illumination value of brightness, carry out image rendering according to described final illumination value.
In the embodiment of the present invention, the described illumination variation template preset, be generally art designing personnel according to image display effect, experience etc., the illumination variation template pre-set.
By the value of the angle according to direction of illumination and vertex normal direction, from the corresponding brightness stencil value of described illumination variation template extraction, the brightness of image can be changed according to the change of the angle in direction of illumination and vertex normal direction, and therefore, the picture of display is truer.
Further, in order to make the picture of display more three-dimensional, the embodiment of the present invention also proposes, described illumination variation template can comprise plural interval, a span of described angle that each interval is corresponding, wherein, the brightness stencil value in same interval is identical, and the brightness stencil value in different interval is different.
In the value according to described angle, during from the brightness stencil value of illumination variation template extraction each pixel preset, first determine the span at the value place of described angle, in then corresponding with this span described illumination variation module interval, extract brightness stencil value.
By illumination variation template is divided into different intervals, brightness value in same interval is identical, brightness value in different interval is different, can make when the variable angle in direction of illumination and vertex normal direction is little, the adjustment of same magnitude is carried out in the brightness of opposite vertexes illumination value, when the variable angle in direction of illumination and vertex normal direction is larger, the adjustment of different amplitude is carried out in the brightness of opposite vertexes illumination value, thus makes picture more have corner angle, display effect more three-dimensional.And, when the brightness stencil value in same interval is identical, the storage space stored required for illumination variation template can also be reduced.
Fig. 2 is the schematic diagram of the brightness change template that the embodiment of the present invention provides.
In Fig. 2, the shade of filling is more intensive, represent that brightness is darker, otherwise, the shade of filling is more sparse, represent brighter display, from left to right represent that the angle in direction of illumination and vertex normal direction is ascending, as seen from Figure 2, illumination variation template divide into 3 intervals from left to right, and the brightness stencil value in each interval is identical, and the angle in direction of illumination and vertex normal direction is less, corresponding brightness is darker, and illumination variation template also can be divided into more or less interval, specifically can determine according to actual conditions.
In another embodiment, described brightness change template also can brightness stencil value gradual change in same interval, the brightness stencil value sudden change in different interval.
Because the display screen of mobile terminal is general less, if the image of display is too level and smooth, stereoscopic sensation can be lacked, therefore, the embodiment of the present invention also proposes, and can, on the basis of adjustment brightness, be image interpolation shade further, thus make rendering effect more three-dimensional, be more suitable for showing on mobile terminals.Particularly:
Determine the direction of visual lines of each pixel of image to be rendered and the angle in vertex normal direction, according to the value of the angle in described direction of visual lines and vertex normal direction, be defined as the shadow factor that each pixel adds shade, when carrying out image rendering according to described final illumination value, the difference default shade reference value being deducted described final illumination value gained is multiplied by described shadow factor, and then add described final illumination value, obtaining the final illumination value after with the addition of shade, carrying out image rendering according to the addition of the final illumination value after shade.
Wherein, can deduct the shadow factor of n power as each pixel of the difference of the dot-product gained in described direction of visual lines and vertex normal direction using 1, n is not less than 1.Wherein, the value of n is larger, and the shade of interpolation is thinner, and in order to avoid the shade added is too thick and heavy, affect the authenticity that picture shows, only can strengthen dark face, now, the value of n can be bigger than normal, and such as value is 4,5 etc.
In order to reduce calculated amount, above-mentioned image rendering method being more applicable for and running on mobile terminals, save the computational resource of mobile terminal, the embodiment of the present invention also proposes:
Can first in space, summit, calculate the angle in the per-vertex lighting value on each summit of image to be rendered, the direction of illumination on each summit and the angle in vertex normal direction, the direction of visual lines on each summit and vertex normal direction.
Then, in pixel space, according to the corresponding relation of space, summit and pixel space, be converted to the angle in illumination value and direction of illumination that in pixel space, each pixel is corresponding and vertex normal direction, that is: according to the per-vertex lighting value on described each summit, determine the per-vertex lighting value of each pixel of image to be rendered, according to the direction of illumination on described each summit and the angle in vertex normal direction, determine the direction of illumination of each pixel of image to be rendered and the angle in vertex normal direction, according to the direction of visual lines on described each summit and the angle in vertex normal direction, determine the direction of visual lines of each pixel of image to be rendered and the angle in vertex normal direction.
Because the calculating of per-vertex lighting value and various angle all completes in space, summit, the calculated amount in space, summit is general less, and therefore, the embodiment of the present invention is particularly useful for carrying out image rendering on mobile terminals.
According to said method, the embodiment of the present invention additionally provides a kind of image rendering device, specifically refers to Fig. 3.
Fig. 3 is the image rendering apparatus structure schematic diagram that the embodiment of the present invention provides.
As shown in Figure 3, this device comprises illumination and angle determination module 301, gets look module 302 and adjusting module 303.
Illumination and angle determination module 301, for the direction of illumination of per-vertex lighting value and each pixel of determining each pixel of image to be rendered and the angle in vertex normal direction.
Get look module 302, for the value according to described direction of illumination and vertex normal angular separation, from the brightness stencil value of each pixel of illumination variation template extraction preset.
Adjusting module 303, difference for the per-vertex lighting value gained brightness stencil value of each pixel being deducted this pixel is multiplied by default brightness adjustment coefficient, and then add the per-vertex lighting value of this pixel, be adjusted the final illumination value of brightness, carry out image rendering according to described final illumination value.
Wherein, described illumination variation template comprises plural interval, a span of described angle that each interval is corresponding, and the brightness stencil value in same interval is identical, and the brightness stencil value in different interval is different; Or, the brightness stencil value gradual change in same interval, the brightness stencil value sudden change in different interval.
Get look module 302, may be used for the span at the value place determining described angle, in interval corresponding with this span described illumination variation module, extract brightness stencil value.
Wherein, adjusting module 303 can comprise brightness adjusting section and shade interpolation module.
Described brightness adjusting section, difference for the per-vertex lighting value gained brightness stencil value of each pixel being deducted this pixel is multiplied by default brightness adjustment coefficient, and then add the per-vertex lighting value of this pixel, be adjusted the final illumination value of brightness.
Illumination and angle determination module 301, for the angle of the direction of visual lines and vertex normal direction of determining each pixel of image to be rendered.
Described shade adds module, for the value of the angle according to described direction of visual lines and vertex normal direction, be defined as the shadow factor that each pixel adds shade, the difference default shade reference value being deducted described final illumination value gained is multiplied by described shadow factor, and then add described final illumination value, obtaining the final illumination value after with the addition of shade, carrying out image rendering according to the addition of the final illumination value after shade.
Wherein, described shade adds module, and for deducting the shadow factor of n power as each pixel of the difference of the dot-product gained in described direction of visual lines and vertex normal direction using 1, wherein, n is not less than 1.
Wherein, illumination and angle determination module 301 can comprise illumination and angle calcu-lation module and illumination and angle modular converter.
Described illumination and angle calcu-lation module, in space, summit, calculate the angle in the per-vertex lighting value on each summit of image to be rendered, the direction of illumination on each summit and the angle in vertex normal direction, the direction of visual lines on each summit and vertex normal direction.
Described illumination and angle modular converter, for in pixel space, according to the per-vertex lighting value on described each summit, determine the per-vertex lighting value of each pixel of image to be rendered, according to the direction of illumination on described each summit and the angle in vertex normal direction, determine the direction of illumination of each pixel of image to be rendered and the angle in vertex normal direction, according to the direction of visual lines on described each summit and the angle in vertex normal direction, determine the direction of visual lines of each pixel of image to be rendered and the angle in vertex normal direction.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. an image rendering method, is characterized in that, the method comprises:
Determine the angle in the per-vertex lighting value of each pixel of image to be rendered and the direction of illumination of each pixel and vertex normal direction;
According to the value of described direction of illumination and vertex normal angular separation, from the brightness stencil value of each pixel of illumination variation template extraction preset;
The difference brightness stencil value of each pixel being deducted the per-vertex lighting value gained of this pixel is multiplied by default brightness adjustment coefficient, and then add the per-vertex lighting value of this pixel, be adjusted the final illumination value of brightness, carry out image rendering according to described final illumination value.
2. method according to claim 1, is characterized in that, described illumination variation template comprises plural interval, a span of described angle that each interval is corresponding;
According to the value of described angle, comprise from the brightness stencil value of each pixel of illumination variation template extraction preset:
Determine the span at the value place of described angle, in interval corresponding with this span described illumination variation module, extract brightness stencil value;
Wherein, the brightness stencil value in same interval is identical, and the brightness stencil value in different interval is different; Or, the brightness stencil value gradual change in same interval, the brightness stencil value sudden change in different interval.
3. method according to claim 1, is characterized in that, the method also comprises:
Determine the direction of visual lines of each pixel of image to be rendered and the angle in vertex normal direction;
According to the value of the angle in described direction of visual lines and vertex normal direction, be defined as the shadow factor that each pixel adds shade;
Carry out image rendering according to described final illumination value to comprise:
The difference default shade reference value being deducted described final illumination value gained is multiplied by described shadow factor, and then adds described final illumination value, obtains the final illumination value after with the addition of shade, carries out image rendering according to the addition of the final illumination value after shade.
4. method according to claim 1, is characterized in that, the shadow factor being defined as each pixel interpolation shade comprises:
Deduct the shadow factor of n power as each pixel of the difference of the dot-product gained in described direction of visual lines and vertex normal direction using 1, wherein, n is not less than 1.
5. method according to claim 3, is characterized in that,
In space, summit, calculate the angle in the per-vertex lighting value on each summit of image to be rendered, the direction of illumination on each summit and the angle in vertex normal direction, the direction of visual lines on each summit and vertex normal direction;
In pixel space, according to the per-vertex lighting value on described each summit, determine the per-vertex lighting value of each pixel of image to be rendered, according to the direction of illumination on described each summit and the angle in vertex normal direction, determine the direction of illumination of each pixel of image to be rendered and the angle in vertex normal direction, according to the direction of visual lines on described each summit and the angle in vertex normal direction, determine the direction of visual lines of each pixel of image to be rendered and the angle in vertex normal direction.
6. an image rendering device, is characterized in that, this device comprises illumination and angle determination module, gets look module and adjusting module;
Described illumination and angle determination module, for the direction of illumination of per-vertex lighting value and each pixel of determining each pixel of image to be rendered and the angle in vertex normal direction;
Describedly get look module, for the value according to described direction of illumination and vertex normal angular separation, from the brightness stencil value of each pixel of illumination variation template extraction preset;
Described adjusting module, difference for the per-vertex lighting value gained brightness stencil value of each pixel being deducted this pixel is multiplied by default brightness adjustment coefficient, and then add the per-vertex lighting value of this pixel, be adjusted the final illumination value of brightness, carry out image rendering according to described final illumination value.
7. device according to claim 6, it is characterized in that, described illumination variation template comprises plural interval, a span of described angle that each interval is corresponding, brightness stencil value in same interval is identical, and the brightness stencil value in different interval is different; Or, the brightness stencil value gradual change in same interval, the brightness stencil value sudden change in different interval;
Describedly getting look module, for determining the span at the value place of described angle, in interval corresponding with this span described illumination variation module, extracting brightness stencil value.
8. device according to claim 6, is characterized in that, described adjusting module comprises brightness adjusting section and shade adds module;
Described brightness adjusting section, difference for the per-vertex lighting value gained brightness stencil value of each pixel being deducted this pixel is multiplied by default brightness adjustment coefficient, and then add the per-vertex lighting value of this pixel, be adjusted the final illumination value of brightness;
Described illumination and angle determination module, for the angle of the direction of visual lines and vertex normal direction of determining each pixel of image to be rendered;
Described shade adds module, for the value of the angle according to described direction of visual lines and vertex normal direction, be defined as the shadow factor that each pixel adds shade, the difference default shade reference value being deducted described final illumination value gained is multiplied by described shadow factor, and then add described final illumination value, obtaining the final illumination value after with the addition of shade, carrying out image rendering according to the addition of the final illumination value after shade.
9. device according to claim 6, is characterized in that,
Described shade adds module, and for deducting the shadow factor of n power as each pixel of the difference of the dot-product gained in described direction of visual lines and vertex normal direction using 1, wherein, n is not less than 1.
10. device according to claim 8, is characterized in that, described illumination and angle determination module comprise illumination and angle calcu-lation module and illumination and angle modular converter;
Described illumination and angle calcu-lation module, in space, summit, calculate the angle in the per-vertex lighting value on each summit of image to be rendered, the direction of illumination on each summit and the angle in vertex normal direction, the direction of visual lines on each summit and vertex normal direction;
Described illumination and angle modular converter, for in pixel space, according to the per-vertex lighting value on described each summit, determine the per-vertex lighting value of each pixel of image to be rendered, according to the direction of illumination on described each summit and the angle in vertex normal direction, determine the direction of illumination of each pixel of image to be rendered and the angle in vertex normal direction, according to the direction of visual lines on described each summit and the angle in vertex normal direction, determine the direction of visual lines of each pixel of image to be rendered and the angle in vertex normal direction.
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| CN109985384A (en) * | 2019-03-21 | 2019-07-09 | 网易（杭州）网络有限公司 | Textures dynamic adjusting method and device |
| CN109985384B (en) * | 2019-03-21 | 2022-10-04 | 网易（杭州）网络有限公司 | Method and device for dynamically adjusting map |
| CN110354499A (en) * | 2019-07-15 | 2019-10-22 | 网易（杭州）网络有限公司 | The method and device of profile photocontrol |
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