Unity shader built-in variables

One transformation matrices

UNITY_MATRIX_MVP from object space to projection space (projection)

UNITY_MATRIX_MV from object space to camera space

Unity_matrix_v from World space to camera space

Unity_matrix_p from camera space to projection space

UNITY_MATRIX_VP from World space to projection space

Transpose matrix of UNITY_MATRIX_T_MV UNITY_MATRIX_MV

UNITY_MATRIX_IT_MV the inverse matrix of the UNITY_MATRIX_MV, the matrix transformation of the normal needs to use the reversal matrix of the transformation matrix.

_object2world from object space to world space

_world2object _object2world's inverse matrix, from world space to object space

second, Camera and screen

Name	Type	Value
_worldspacecamerapos	Float3	World space position of the camera. Camera's World coordinates
_projectionparams	Float4	Xis 1.0 (or–1.0 if currently rendering with aflipped projection matrix), is the camera's near y plane, is the z camera ' s far plane and is w 1/farplane. The X value is 1.0 or-1.0 (when the projection matrix is inverted) Y near section, Z far section, W 1/Far cross section
_screenparams	Float4	xIs the camera's render target width in pixels, is the y camera's render target height in pixels, is z 1.0 + 1.0/width and is w 1.0 + 1.0/height. Screen size x width, y high, z 1+1.0/width,w 1+1.0/height
_zbufferparams	Float4	Used to linearize Z buffer values. x Is (1-far/near), was ( y far/near), is z (X/far) and is w (Y/far). For linearization of ZBuffer
Unity_orthoparams	Float4	xIs orthographic camera's width, is y orthographic camera's height, is unused and was z w 1.0 when camera is Orthograp HIC, 0.0 when perspective. orthogonal Camera related parameters, W value 1 is orthogonal projection, 0 o'clock is perspective projection
Unity_cameraprojection	float4x4	Camera ' s projection matrix. Projection matrix of the camera
Unity_camerainvprojection	float4x4	Inverse of camera ' s projection matrix. Inverse matrix of the projection matrix of the camera
UNITY_CAMERAWORLDCLIPPLANES[6]	Float4	Camera frustum plane World space equations, in this order:left, right, bottom, top, near, far. The right and left of the cone of view

Three, time

Name	Type	Value
_time	float4	time since level load (T/20, T, T*2, t*3), 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). Frame interval Time

Four illumination variables for forward rendering

Name	Type	Value
_lightcolor0(declared in Lighting.cginc)	Fixed4	Light color. Light color
_worldspacelightpos0	Float4	Directional Lights: (World Space Direction, 0). Other lights: (World space Position, 1). World space Illumination Position, the W value of the parallel light is 0, the other light source has a W value of 1
_lightmatrix0(declared in Autolight.cginc)	float4x4	World-to-light Matrix. Used to sample cookies & attenuation textures. World space goes to light space matrix
Unity_4lightposx0, Unity_4lightposy0, unity_4lightposz0	Float4	(Forwardbase pass only)world space positions of the first four non-important point lights.
Unity_4lightatten0	Float4	(Forwardbase pass only)attenuation factors of the first four non-important point lights.
Unity_lightcolor	HALF4[4]	(Forwardbase pass only)colors of the first four non-important point lights.

v. Delayed illumination-related variables

Name	Type	Value
_lightcolor	float4	Span style= "FONT-SIZE:16PX;" >light color. Light colors
_lightmatrix0	float4x4	world-to-light Matrix. Used to sample cookies & attenuation textures. world space goes to light space matrix  

Six vertex illumination related variables

Name	Type	Value
Unity_lightcolor	HALF4[8]	Light colors. Light color
Unity_lightposition	FLOAT4[8]	View-space light positions. (-direction,0) for directional lights; (position,1) for point/spot lights. View space illumination position, the W value of the parallel light is 0, and the other light source has a W value of 1
Unity_lightatten	HALF4[8]	Light attenuation factors. xis cos (SPOTANGLE/2) or–1 for non-spot lights; yis 1/cos (SPOTANGLE/4) or 1 for non-spot lights; zis quadratic attenuation; Wis squared light range. Light Attenuation value
Unity_spotdirection	FLOAT4[8]	View-space spot light positions; (0,0,1,0) for non-spot lights. View Space Spotlight Location

Unity shader built-in variables