Direct3D Lighting and textures

Today we will learn the light source and material inside the Direct3D.

Four types of illumination:

Ambient light	Ambient Light	An object is not directly irradiated by light, and it can be seen by the light that is reflected by each object. This is called ambient light
Diffuse reflection Light	Diffuse light	This type of light travels in a particular direction, and when it reaches a certain surface it will reflect evenly around (focusing on the spatial position and direction of the reflected light)
Specular Reflection Light	Specular light	When such light reaches a surface, it is strictly reflected in one direction.
Self-luminous	Emissive Light	Self-illumination is the object's own glow.

Opening of ambient light:

Device->setrenderstate (D3drs_ambient,d3dcolor_xrgb ());

Mirror-reflective light on:

Device->setrenderstate (d3drs_specularenable,true);

Three main types of light sources:

Point Light has a color and position, but no direction, it emits light in all directions, and the light is not attenuated by distance

Directional lights (direction light) propagate in the same direction in the scene, with color and orientation, unaffected by attenuation and range.

Spotlight source, in our lives a flashlight consists of an inner cylinder and an outer cylinder, and the light decays gradually from the center to the periphery. Phi and Theta are the inner angle sizes of two cones respectively.

To create a point light:

D3dlight9 light;::zeromemory (&light,sizeof(light)); Type= D3dlight_point;//various light types, now point lightLight. Ambient = D3dxcolor (0.8f,0.8f,0.8f,1.0f);//The following three parameters are ambient light, diffuse light, specular light color valueLight. Diffuse = D3dxcolor (1.0f,1.0f,1.0f,1.0f); light. Specular= D3dxcolor (0.3f,0.3f,0.3f,1.0f); light. Position= D3dxvector3 (0.0f,200.0f,0.0f);//coordinate positionLight. Attenuation0 =1.0f;//The following three parameters are the coefficients of light attenuation along the distanceLight. Attenuation1 =0.0f; Light. Attenuation2=0.0f; Light. Range=300.0f;//The range of illumination, which is effective in some light sourcesDevice->setlight (0, &light);//Set the lightDevice->lightenable (0,true);//turn on the light

To create a directional light:

//Creating directional lightsD3dlight9 light;::zeromemory (&light,sizeof(light)); Type= D3dlight_directional;//Directional LightLight. Ambient = D3dxcolor (0.5f,0.5f,0.5f,1.0f); light. Diffuse= D3dxcolor (1.0f,1.0f,1.0f,1.0f); light. Specular= D3dxcolor (0.3f,0.3f,0.3f,1.0f); light. Direction= D3dxvector3 (0.0f,0.0f,1.0f);D Evice->setlight (0,&Light );D Evice->lightenable (0,true);

To create a spotlight:

D3dlight9 light;::zeromemory (&light,sizeof(light)); Type=D3dlight_spot;light. Position= D3dxvector3 (100.0f,100.0f,100.0f); light. Direction= D3dxvector3 (-1.0f,-1.0f,-1.0f); light. Ambient= D3dxcolor (0.3f,0.3f,0.3f,1.0f); light. Diffuse= D3dxcolor (1.0f,1.0f,1.0f,1.0f); light. Specular= D3dxcolor (0.3f,0.3f,0.3f,0.3f); light. Attenuation0=1.0f; light. Attenuation1=0.0f; light. Attenuation2=0.0f; light. Range=300.0f; light. Falloff=0.1f; light. Phi= D3DX_PI/3.0f; light. Theta= D3DX_PI/6.0f;D Evice->setlight (0,&Light );D Evice->lightenable (0,true);

Material:

Light and material like two good friends, the material properties of the surface of the object determines what color it can reflect the light , and how much can be reflected, the material belongs to an object ,

To learn how to create a material

//To create a material:d3dmaterial9 mtrl;::zeromemory (&mtrl,sizeof(Mtrl)); Mtrl. Ambient= D3dxcolor (0.5f,0.5f,0.7f,1.0f);//indicates the reflectivity of the object surface to ambient light, fill in a color, ARGB value between 0-1Mtrl. Diffuse = D3dxcolor (0.6f,0.6f,0.6f,1.0f);//reflectivity of diffuse reflection lightMtrl. Specular = D3dxcolor (0.3f,0.3f,0.3f,0.3f);//reflectivity of specular reflection lightMtrl. emissive = D3dxcolor (0.0f,0.0f,0.0f,1.0f);//reflectivity of the spontaneous light colorMtrl. Power =0.1f;D Evice->setmaterial (&mtrl);//Set Material

The sum of the brightness of the vertex color of an object has a formula:

Color sum = ambient light + Diffuse reflection light + specular light + spontaneous light

Direct3D Lighting and textures