As an exercise written by the shader, I use the shader to realize the translation, scaling and rotation of the object. The code here is only for reference. Try not to use the if statement in the shader code to judge.
The effect is as follows:
The shader code is as follows:
Shader "Unlit/CustomChange"
{
Properties
{
//显示一个下拉菜单
[Enum(Translational,0,Scale,1,Rotation,2)]_Transform("Transform",float) = 0
_Translational("Translational",vector) = (0.0,0.0,0.0,0.0)
_Scale("Scale",vector) = (1.0,1.0,1.0,1.0)
_Rotation("Rotation",vector) = (0.0,0.0,0.0,1.0)
}
SubShader
{
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
uniform float _Transform;
uniform float4 _Translational;
uniform float4 _Scale;
uniform float4 _Rotation;
struct appdata
{
float4 vertex : POSITION;
};
struct v2f
{
float4 color:COLOR;
float4 vertex : SV_POSITION;
};
//平移矩阵
float4x4 Translational(float4 translational)
{
return float4x4(1.0, 0.0, 0.0, translational.x,
0.0, 1.0, 0.0, translational.y,
0.0, 0.0, 1.0, translational.z,
0.0, 0.0, 0.0, 1.0);
}
//缩放矩阵
float4x4 Scale(float4 scale)
{
return float4x4(scale.x, 0.0, 0.0, 0.0,
0.0, scale.y, 0.0, 0.0,
0.0, 0.0, scale.z, 0.0,
0.0, 0.0, 0.0, 1.0);
}
//旋转矩阵
float4x4 Rotation(float4 rotation)
{
float radX = radians(rotation.x);
float radY = radians(rotation.y);
float radZ = radians(rotation.z);
float sinX = sin(radX);
float cosX = cos(radX);
float sinY = sin(radY);
float cosY = cos(radY);
float sinZ = sin(radZ);
float cosZ = cos(radZ);
return float4x4(cosY*cosZ, -cosY * sinZ, sinY, 0.0,
cosX*sinZ + sinX * sinY*cosZ, cosX*cosZ - sinX * sinY*sinZ, -sinX * cosY, 0.0,
sinX*sinZ - cosX * sinY*cosZ, sinX*cosZ + cosX * sinY*sinZ, cosX*cosY, 0.0,
0.0, 0.0, 0.0, 1.0);
}
v2f vert (appdata v)
{
v2f o;
//在模型空间计算，坐标和矩阵相乘
if (_Transform == 0)
{
v.vertex = mul(Translational(_Translational), v.vertex);
}
else if (_Transform == 1)
{
v.vertex = mul(Scale(_Scale), v.vertex);
}
else
{
v.vertex = mul(Rotation(_Rotation), v.vertex);
}
o.vertex = UnityObjectToClipPos(v.vertex);//将坐标从模型空间转到裁切空间
o.color = float4(1, 0, 0, 1);
return o;
}
fixed4 frag (v2f i) : COLOR
{
return i.color;
}
ENDCG
}
}
}
For detailed explanations, please see the link: Translation, scaling, and rotation in Unity Shader
In order to be more convenient to use, I combined the three transformation forms and wrote a new copy. If you are interested, you can take a look.
The effect is as follows:
The shader code is as follows:
Shader "Unlit/CustomChange(Blend)"
{
Properties
{
_Translational("Translational",vector) = (0.0,0.0,0.0,0.0)
_Scale("Scale",vector) = (1.0,1.0,1.0,1.0)
_Rotation("Rotation",vector) = (0.0,0.0,0.0,1.0)
}
SubShader
{
Pass
{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"
//uniform float _Transform;
uniform float4 _Translational;
uniform float4 _Scale;
uniform float4 _Rotation;
struct appdata
{
float4 vertex : POSITION;
};
struct v2f
{
float4 color:COLOR;
float4 vertex : SV_POSITION;
};
//平移矩阵
float4x4 Translational(float4 translational)
{
return float4x4(1.0, 0.0, 0.0, translational.x,
0.0, 1.0, 0.0, translational.y,
0.0, 0.0, 1.0, translational.z,
0.0, 0.0, 0.0, 1.0);
}
//缩放矩阵
float4x4 Scale(float4 scale)
{
return float4x4(scale.x, 0.0, 0.0, 0.0,
0.0, scale.y, 0.0, 0.0,
0.0, 0.0, scale.z, 0.0,
0.0, 0.0, 0.0, 1.0);
}
//旋转矩阵
float4x4 TRSBlend(float4 rotation)
{
float radX = radians(rotation.x);
float radY = radians(rotation.y);
float radZ = radians(rotation.z);
float sinX = sin(radX);
float cosX = cos(radX);
float sinY = sin(radY);
float cosY = cos(radY);
float sinZ = sin(radZ);
float cosZ = cos(radZ);
float4x4 r= float4x4(cosY*cosZ, -cosY * sinZ, sinY, 0.0,
cosX*sinZ + sinX * sinY*cosZ, cosX*cosZ - sinX * sinY*sinZ, -sinX * cosY, 0.0,
sinX*sinZ - cosX * sinY*cosZ, sinX*cosZ + cosX * sinY*sinZ, cosX*cosY, 0.0,
0.0, 0.0, 0.0, 1.0);
float4x4 tr = mul(Translational(_Translational), r);
return mul(tr, Scale(_Scale));
}
v2f vert(appdata v)
{
v2f o;
//在模型空间计算
v.vertex = mul(TRSBlend(_Rotation), v.vertex);
o.vertex = UnityObjectToClipPos(v.vertex);//将坐标从模型空间转到裁切空间
o.color = float4(1, 0, 0, 1);
return o;
}
fixed4 frag(v2f i) : COLOR
{
return i.color;
}
ENDCG
}
}
}