D3d materials and lighting

In our daily life, we see ambient light, diffuse light, reflective plane light, and the light emitted by the object. Therefore, we must describe the response to these light when defining the material.

Let's take a look at the definition of the material structure:

 

Typedef struct _ d3dmaterial9 {
D3dcolorvalue diffuse;/* diffuse color rgba */
D3dcolorvalue ambient;/* ambient color RGB */
D3dcolorvalue specular;/* specular 'shininess '*/
D3dcolorvalue emissive;/* emissive color RGB */
Float power;/* sharpness if specular highlight */
} D3dmaterial9;

 

Typedef struct _ d3dcolorvalue {float R; float g; float B; float;
} D3dcolorvalue;

 

Diffuse: specifies the amount of diffuse light reflected on the surface.

Ambient: specifies the amount of ambient light reflected on the surface.

Specular: specifies the number of border light emitted from the surface.

Emissive: This is used to add a color to the surface to specify the color of the light emitted by the object itself.

 

Each value in the material is in the d3dcolorvalue structure. This structure actually reflects how much the color of a certain light is reflected by this material.

D3dmaterial9 matrl;

Matrl. Diffuse. r = 0.5f;

Matrl. Diffuse. B = 1.0f;

Matrl. Diffuse. G = 0.0f;

The result is the diffuse reflection light. This material will reflect half of the red light, all the blue light, and all the green light absorption.

 

 

It is also very important that you can turn on the light source when rendering a model, while you can turn off the light source when rendering another model. in the past, my understanding was that after a light source was selected in the scenario, all models in the scenario were always affected. the light source can be turned on at any time to turn off the light source. you can set another light source at any time.