Transformations
- 都是 float4
- UNITY_MATRIX_MVP Current model view projection matrix.
- UNITY_MATRIX_MV Current model * view matrix.
- UNITY_MATRIX_V Current view matrix.
- UNITY_MATRIX_P Current projection matrix.
- UNITY_MATRIX_VP Current view * projection matrix.
- UNITY_MATRIX_T_MV Transpose of model * view matrix.
- UNITY_MATRIX_IT_MV Inverse transpose of model * view matrix.
- _Object2World Current model matrix.
- _World2Object Inverse of current world matrix.
Camera and screen
- _WorldSpaceCameraPos float3 World space position of the camera.
- _ProjectionParams float4 x is 1.0 (or –1.0 if currently rendering with a flipped projection matrix), y is the camera’s near plane, z is the camera’s far plane and w is 1/FarPlane.
- _ScreenParams float4 x is the camera’s render target width in pixels, y is the camera’s render target height in pixels, z is 1.0 + 1.0/width and w is 1.0 + 1.0/height.
- _ZBufferParams float4 Used to linearize Z buffer values. x is (1-far/near), y is (far/near), z is (x/far) and w is (y/far).
- unity_OrthoParams float4 x is orthographic camera’s width, y is orthographic camera’s height, z is unused and w is 1.0 when camera is orthographic, 0.0 when perspective.
- unity_CameraProjection float4x4 Camera’s projection matrix.
- unity_CameraInvProjection float4x4 Inverse of camera’s projection matrix.
- unity_CameraWorldClipPlanes[6] float4 Camera frustum plane world space equations, in this order: left, right, bottom, top, near, far.
Time
- _Time float4 Time since level load (t/20, t, t2, t3), use to animate things inside the shaders.
- _SinTime float4 Sine of time: (t/8, t/4, t/2, t).
- _CosTime float4 Cosine of time: (t/8, t/4, t/2, t).
- unity_DeltaTime float4 Delta time: (dt, 1/dt, smoothDt, 1/smoothDt).
Lighting
- _LightColor0 (declared in Lighting.cginc) fixed4 Light color.
- _WorldSpaceLightPos0 float4 Directional lights: (world space direction, 0). Other lights: (world space position, 1).
- _LightMatrix0 (declared in AutoLight.cginc) float4x4 World-to-light matrix. Used to sample cookie & attenuation textures.
- unity_4LightPosX0, unity_4LightPosY0, unity_4LightPosZ0 float4 (ForwardBase pass only) world space positions of first four non-important point lights.
- unity_4LightAtten0 float4 (ForwardBase pass only) attenuation factors of first four non-important point lights.
unity_LightColor half4[4] (ForwardBase pass only) colors of of first four non-important point lights.
_LightColor float4 Light color.
_LightMatrix0 float4x4 World-to-light matrix. Used to sample cookie & attenuation textures.
unity_LightColor half4[8] Light colors.
- unity_LightPosition float4[8] View-space light positions. (-direction,0) for directional lights; (position,1) for point/spot lights.
- unity_LightAtten half4[8] Light attenuation factors. x is cos(spotAngle/2) or –1 for non-spot lights; y is 1/cos(spotAngle/4) or 1 for non-spot lights; z is quadratic attenuation; w is squared light range.
- unity_SpotDirection float4[8] View-space spot light positions; (0,0,1,0) for non-spot lights.
Fog and Ambient
- unity_AmbientSky fixed4 Sky ambient lighting color in gradient ambient lighting case.
- unity_AmbientEquator fixed4 Equator ambient lighting color in gradient ambient lighting case.
- unity_AmbientGround fixed4 Ground ambient lighting color in gradient ambient lighting case.
UNITY_LIGHTMODEL_AMBIENT fixed4 Ambient lighting color (sky color in gradient ambient case). Legacy variable. - unity_FogColor fixed4 Fog color.
- unity_FogParams float4 Parameters for fog calculation: (density / sqrt(ln(2)), density / ln(2), –1/(end-start), end/(end-start)). x is useful for Exp2 fog mode, y for Exp mode, z and w for Linear mode.
Various
- unity_LODFade float4 Level-of-detail fade when using LODGroup. x is fade (0..1), y is fade quantized to 16 levels, z and w unused.
