顶点扭曲

来源：互联网发布：蓝牙音箱品牌知乎编辑：程序博客网时间：2024/04/30 06:33

1.顶点绕Y轴旋转

Shader "Custom/test1" {    SubShader {        pass        {            CGPROGRAM            #pragma vertex vert            #pragma fragment frag             #include "unitycg.cginc"            struct v2f{                float4 pos:POSITION;                fixed4 col:COLOR;            };            v2f vert(appdata_base v)            {                //声明一个随时间变化的角度                float angle = length(v.vertex)*_SinTime.w;                //声明一个绕着y轴的旋转矩阵                float4x4 m={                    float4(cos(angle),0,sin(angle),0),                    float4(0,1,0,0),                    float4(-sin(angle),0,cos(angle),0),                    float4(0,0,0,1)                };                //在mvp执行之前先通过旋转来影响顶点信息                //v.vertex = mul(m,v.vertex);                //也可以直接对x z做计算 不需要进行矩阵乘法 减少计算量                float x = cos(angle)*v.vertex.x+sin(angle)*v.vertex.z;                float z = -sin(angle)*v.vertex.x+cos(angle)*v.vertex.z;                v.vertex.x = x;                v.vertex.z = z;                v2f o;                o.pos = mul(UNITY_MATRIX_MVP,v.vertex);                o.col = float4(0,1,1,1);                return o;            }            fixed4 frag(v2f IN):COLOR            {                return IN.col;            }            ENDCG        }    }}

2.x随时间分量缩放

Shader "Custom/test1" {    SubShader {        pass        {            CGPROGRAM            #pragma vertex vert            #pragma fragment frag             #include "unitycg.cginc"            struct v2f{                float4 pos:POSITION;                fixed4 col:COLOR;            };            v2f vert(appdata_base v)            {                //声明一个随时间变化的角度                float angle = length(v.vertex)*_SinTime.w;                //声明一个绕着y轴的旋转矩阵                float4x4 m={                    float4(cos(angle),0,sin(angle),0),                    float4(0,1,0,0),                    float4(-sin(angle),0,cos(angle),0),                    float4(0,0,0,1)                };                //在mvp执行之前先通过旋转来影响顶点信息                //v.vertex = mul(m,v.vertex);                //也可以直接对x z做计算 不需要进行矩阵乘法 减少计算量                //float x = cos(angle)*v.vertex.x+sin(angle)*v.vertex.z;                //float z = -sin(angle)*v.vertex.x+cos(angle)*v.vertex.z;\                float sangle = v.vertex.z+_Time.y;                float x = (sin(sangle)/8+0.5)*v.vertex.x;                v.vertex.x = x;                //v.vertex.z = z;                v2f o;                o.pos = mul(UNITY_MATRIX_MVP,v.vertex);                o.col = float4(0,1,1,1);                return o;            }            fixed4 frag(v2f IN):COLOR            {                return IN.col;            }            ENDCG        }    }}

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