JPH0594539A - Device and method for analyzing optical environment - Google Patents

Abstract

PURPOSE:To obtain an optical environment analyzing method capable of improving a calculation speed as high as possible without reducing accuracy. CONSTITUTION:A face forming an environment space to be analyzed is divided into several faces, a prescribed face having the maximum quantity of radiated light out of the divided faces is set up as a light source 1, the prescribed number of beams are radiated from the light source 1, respective faces at which respective beams arrive are searched, the quantity of light arriving at each searched face is calculated, the quantity of arriving beams on the prescribed face having the maximum light quantity is set up as a light source, the number of radiation beams is determined correspondingly to the quantity of radiated light, the light quantity of respective faces is calculated by the procedure, and similar operation is repeated to obtain the final light quantity of respective faces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light environment analysis apparatus and a light environment analysis method for simulating illumination, lighting, and the like.

[0002]

2. Description of the Related Art When a lighting device is installed in a room, the light environment can be quantitatively obtained by calculating the values of illuminance and brightness in each part of the room before actually installing the device. Is desired. When performing such an analysis, it is necessary to take into consideration not only the direct light from the light source but also the reflected light from the wall surface.

Conventionally, a method called the radiosity method can be used to perform calculations taking such reflected light into consideration ("Radiosity algorithm for progressively increasing the image quality", Michael F. Cohen, Nikkei CG 1988 1
See January issue P.164-P174 (from "A Progressive Refinement
Approach to Fast Radiosity Image Generation "Mich
ael F. Cohen et al., Computer Graphics, vol.22, no.
4, August 1988 (SIGGRAPH'88 Conference Proceeding),
pp.75-84))).

In this method, the ceiling, side walls, floor, etc. of a room are divided into many planes. Naturally, the illumination light source is present on a certain surface in it.

Therefore, first of all, attention is paid to the surface that most emits light, that is, the surface where the illumination light source exists. Then, light is emitted in all directions from the surface. The angular relationship when determining the ratio of the emitted light reaching each surface,
From the size of the surface, we obtain the form factor. As a method therefor, a method of emitting a line from one point (predetermined light source surface) and calculating from the number of lines reaching each surface can be considered. Figure 5 shows the flow of operations for calculating this form factor.
Shown in. In step S1 in the figure, the emission angle of the light beam is determined. In step S2, the emission light intensity corresponding to the emission angle is obtained. In step S3, the arrival surface of the ray is searched for based on the firing angle. In step S4, the light intensity on the reaching surface is calculated (and added to the light intensity up to that point). In step S5, it is determined whether or not the total specified number of rays to be emitted from the one point has ended. If the emission angle still remains, the light is emitted at the remaining angle and the above calculation is performed. After firing at all angles, in step S6, when light is emitted from one point in all directions,
The intensity of light from that one point on each surface is calculated.

Next, of the surfaces other than the light source surface, the surface having the highest light intensity is searched for. Then, the surface with the strongest light is regarded as a new light source, and that surface is used as a perfect diffusion surface to emit light in all directions, and as described above, the intensity of light on each surface is increased and precision is increased. I will

[0007]

[Problems to be Solved by the Invention] However, form-f
When finding the acter, not only for the light source and the reflecting surface, but for the surface that emits a small amount of light like the reflecting surface, since the number of lines that emerge from one point is the same However, in view of the above accuracy, there is a problem that the number is too large and the calculation time is longer than necessary.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the conventional optical environment analyzing apparatus, and an object of the present invention is to provide an optical environment analyzing apparatus and a light environment analyzing method in which calculation speed is increased and accuracy is not reduced. Is.

[0009]

According to the present invention, a surface forming an environment space to be analyzed is divided into several surfaces, and each of the divided surfaces is selected on the basis of a predetermined criterion relating to the amount of light. A predetermined surface is used as a light source, a predetermined number of light is emitted from the light source, each surface reached by each light is searched, the amount of light reaching that surface is calculated, and further, a predetermined reference is given from among the surfaces. In the light environment analysis device that obtains the final light intensity of each surface by calculating the light intensity of each surface as described above by using the light intensity of the predetermined surface selected based on , Corresponding to the amount of light emitted,
It is an optical environment analysis device comprising a prescribed number determination means for determining the number of emitted light.

Further, according to the present invention, a maximum radiant light amount searching step for searching for a surface having the largest amount of radiating light in an area for analyzing a light environment, which is obtained by dividing a surface such as a light source and a reflecting wall, and the maximum radiant light amount searching step. In the maximum emission amount specified value determination step that compares whether or not the maximum emission amount obtained in step 1 is greater than a predetermined specified value, and to each surface that calculates the amount of light reaching each other surface from the searched surface Arrival light amount calculation step, the light amount obtained in the arrival light amount calculation step on each surface, the arrival light amount addition step of each surface to add to the light amount obtained up to that, and the arrival light amount addition calculation step A step of multiplying the obtained light quantity by the diffuse reflectance of the reaching surface, and setting the emitted light quantity of the radiated surface to 0, and again calculating the emitted maximum light quantity in the surface search step. Find the surface that emits the most light among the quantities, and repeat the same operation to obtain the illuminance, reflected light intensity, etc. of all the surfaces in the calculation area, and the emitted light reaches each surface. In the step of obtaining and adding the quantity, the light emitting angle determination step of determining the emission angle corresponding to the number of emitted light, the emission intensity calculation step of calculating the emission intensity corresponding to the emission angle, and the emitted light To find the surface to be reached, a reaching intensity adding step to add the reaching intensity on the reaching surface, and a rule to determine whether the radiated light has emitted the specified number so that it is emitted in all directions In the light environment analysis method, the number determination step is executed, and the number in the light beam emission angle determination step is determined corresponding to the amount of light to be emitted.

[0011]

In the above structure, when obtaining the amount of light that reaches each surface of the emitted light, in accordance with the amount of emitted light,
Determine the number of radiation. Therefore, the calculation speed can be increased without sacrificing precision.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a flow chart showing the configuration of a light environment analysis method according to an embodiment of the present invention. A three-dimensional space as shown in FIG. 2 is surface-divided, and the surface that emits the most light among the surface elements is searched (the maximum radiated light quantity surface search unit is searched) (step S1 in FIG. 1). Emit. At first, the light source 1 becomes the surface. If there are multiple light sources, the brightest light source is selected. 2 is a mirror surface.

Next, the arrival amount of light from the light source to each surface is obtained (obtained by the reaching light amount calculation section) (step S3 in FIG. 1). The flowchart of FIG. 3 shows the operation for obtaining the arrival amount. As shown in FIG. 4, light is emitted from the emitting surface, and the ratio of reaching each surface is obtained.

The emission angle of the light in step S1 of FIG. 3 and the emission intensity of step S2 are determined by the number of emitted rays.

In this way, the emitted ray is traced and the reaching surface is obtained. Then, it is determined whether or not the number of lights emitted from the light source is the specified number (determined by the specified number determination unit) (step S8 in FIG. 3), and if the specified number is not reached, the light is emitted at another angle. (Step S in FIG. 3
1) The same light tracking is performed.

When the specified number is reached, finally, the amount of light E is emitted from the emitting surface, and the total intensity of light is F.
When the intensity reaching the one surface is G, the amount of light reaching the one surface is calculated as E × G / F in the reaching light amount calculation unit (step S9 in FIG. 3).

By the method described above, the ratio of the light reaching each surface from the predetermined radiation surface is obtained, and the amount of light reaching the surface is added (step S4 in FIG. 1).

The amount of light obtained by multiplying this value by the diffuse reflectance of each surface becomes the amount of light emitted when that surface is used as the light source (step S5 in FIG. 1). In this respect, it is considered as a perfect diffusion surface.

Therefore, in step 1 of FIG. 1, the surface having the maximum value is searched for, and the same operation is repeated to emit light.

At this time, regarding the radiation on the reflecting surface, for example, if the number is increased as shown in FIG. 4, the error becomes smaller. For example, when light is emitted from the light source at 2500 lm and the reflecting surface at 500 lm, The accuracy of obtaining the ratio of reaching the other surface may not be the same in the case of the light source and the case of the reflecting surface. The specified number required for firing is determined from the relationship between accuracy and number and the amount of light emitted. It is desirable to reduce the number as the amount of emitted light decreases. In this way, the illuminance and the amount of diffused light on all surfaces within the calculation amount range as shown in FIG. 2 can be known.

When searching for the surface with the largest light amount of the radiation source, and only the surface that does not reach the predetermined specified value remains, the simulation ends there (step S2 in FIG. 1).

[0023]

As is apparent from the above description, according to the present invention, the number of emitted rays is determined according to the amount of emitted light, so that it is possible to increase the calculation speed while maintaining the accuracy relatively. It is useful for the development and design of lighting equipment.

[Brief description of drawings]

FIG. 1 is a flowchart showing a light environment analysis method of the present invention.

FIG. 2 is a schematic diagram of a space as a target of the optical environment analysis method of the present invention.

FIG. 3 is a flowchart showing a method of calculating the amount of light reaching each surface of the present invention.

FIG. 4 is a graph showing the relationship between the number of emitted light beams and the error according to the present invention.

FIG. 5 is a flowchart for obtaining a light amount on a conventional light arrival surface.

[Explanation of symbols]

 1 light source 2 mirror surface S3 in FIG. 3 arrival surface search step S5 in FIG. 3 arrival surface specular reflection determination step S6 in FIG. 3 specular reflection intensity calculation step S7 in FIG. 3 reflection angle calculation step

Claims (2)

[Claims] 1. A surface forming an environment space to be analyzed is divided into a plurality of surfaces, and a predetermined surface selected from the divided surfaces based on a predetermined reference for the amount of light is used as a light source. Emit a predetermined number of light from, search each surface that each light reaches, calculate the amount of light reaching that surface,
From each surface, the amount of light reaching a predetermined surface selected based on a predetermined reference is used as a light source, the amount of light on each surface is calculated as described above, and by repeating this, An optical environment analyzing apparatus for obtaining a final light quantity, comprising a prescribed number determining means for determining the number of emitted light in accordance with the amount of emitted light. 2. The maximum radiant light amount searching step for searching for a surface having the largest amount of radiating light in an area for analyzing a light environment, which is obtained by dividing a surface such as a light source and a reflecting wall, and the maximum radiant light amount searching step. Maximum radiant light intensity specified value determination step that compares whether or not the maximum radiated light amount is greater than a predetermined stipulated value, and calculation of the amount of light reaching each other surface from the searched surface Step, the amount of light obtained in the reaching light amount calculation step on each surface, the reaching light amount addition step of each surface to be added to the amount of light found so far, to the amount of light found in the reaching light amount addition calculation step And a step of calculating the amount of radiated light that multiplies the diffuse reflectance of the reaching surface, sets the radiated light amount of the radiated surface to 0, and again in the maximum radiated light amount surface search step, the most radiated light amount is calculated. Find the surface that emits a large amount of light, obtain the illuminance of all the surfaces in the calculation area, the reflected light intensity, etc. by repeating the same operation, and then add the amount of the emitted light reaching each surface and add it. In this step, the ray emission angle determination step that determines the emission angle corresponding to the number of emitted light, the emission intensity calculation step that calculates the emission intensity corresponding to the emission angle, and the surface that the emitted light reaches Reachable surface search step,
The reaching intensity adding step of adding the reaching intensity on the reaching surface, and the specified number determination step of determining whether the radiated light has emitted the specified number determined to be emitted in all directions, The light environment analysis method, wherein the number of rays in the ray emission angle determination step is determined corresponding to the amount of light emitted.