unity shader 学习一

最新推荐文章于 2025-02-05 14:23:00 发布

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本文介绍了Shader编程中需要注意的问题，如大小写敏感性、subshader中pass的重要性等，并详细解释了Unity内置变量的作用，包括矩阵变换、光照处理、时间控制等方面的内容。

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shader中注意的问题

1大小写，例如：

#pragma vertex vert

#pragma fragment frag

2、subshader 中pass不可或缺

SV_POSITION 顶点着色器输出的定点位置，裁剪空间中的坐标

SV_Target 描述片元着色器的输出颜色，输出的值将会存储到渲染目标

#pragma 指令告诉unity我们定义的定点着色器和片元着色器的名字

_World2Object 模型空间到世界空间的逆转矩阵

_LightColor0 unity提供的内置变量来处理光源的颜色和强度信息以及光源的方向

saturatge 把参数截取到0--1范围内

a2v 在unity中常用的语义

POSITION float4类型

NORMAL float3类型

TANGENT float4类型

TEXCOORD0到TEXCOORDN float2或者float4类型

COLOR float4或者fixed4类型

v2f 在unity中常用的语义

SV_POSTION

COLOR0

COLOR1

TEXCOORD0--TEXCOORD7


Name	Type	Value
UNITY_MATRIX_MVP	float4x4	Current model * view * projection matrix.模型视图投影矩阵
UNITY_MATRIX_MV	float4x4	Current model * view matrix.模型视图矩阵
UNITY_MATRIX_V	float4x4	Current view matrix.视图矩阵
UNITY_MATRIX_P	float4x4	Current projection matrix.投影矩阵
UNITY_MATRIX_VP	float4x4	Current view * projection matrix.视图投影矩阵
UNITY_MATRIX_T_MV	float4x4	Transpose of model * view matrix.
UNITY_MATRIX_IT_MV	float4x4	Inverse transpose of model * view matrix.模型视图矩阵逆转
UNITY_MATRIX_TEXTURE0 to UNITY_MATRIX_TEXTURE3	float4x4	Texture transformation matrices.
_Object2World	float4x4	Current model matrix.
_World2Object	float4x4	Inverse of current world matrix.
_WorldSpaceCameraPos	float3	World space position of the camera.
unity_Scale	float4	`xyz` components unused; `w` contains scale for uniformly scaled objects.

Name	Type	Value
_ModelLightColor	float4	Material’s Main * Light color
_SpecularLightColor	float4	Material’s Specular * Light color
_ObjectSpaceLightPos	float4	Light’s position in object space. w component is 0 for directional lights, 1 for other lights
_Light2World	float4x4	Light to World space matrix
_World2Light	float4x4	World to Light space matrix
_Object2Light	float4x4	Object to Light space matrix

Name	Type	Value
_Time	float4	Time (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).
_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 current render target width in pixels, `y` is the current render target height in pixels, `z` is 1.0 + 1.0/width and `w` is 1.0 + 1.0/height.