U3d杂谈 — 顶点纹理动画精度问题

最近再使用顶点纹理动画制作动画效果,目的是为了节省资源的消耗。但是当使用一个颜色通道存储一个Mesh顶点位置坐标的时候,发现精度是不够的,毕竟一个RGBA32的每个通道的分量是0-255。导致精度是有限的。所以这里使用一个RGBA 4个通道存储一个顶点的一个方向的坐标值。




    public Color FloatToColor(float f)
        byte[] buffer = BitConverter.GetBytes(f);
        int r = buffer[0];
        int g = buffer[1];
        int b = buffer[2];
        int a = buffer[3];

        return new Color((float)r / 255, (float)g / 255, (float)b / 255, (float)a / 255);


    public float ColorToFloat(Color c)
        byte r = (byte)(c.r * 255);
        byte g = (byte)(c.g * 255);
        byte b = (byte)(c.b * 255);
        byte a = (byte)(c.a * 255);

        List<byte> tempList = new List<byte>();

        byte[] buffer = tempList.ToArray();
        float f = (float)BitConverter.ToSingle(buffer, 0);
        return f;


//m0 是最高位  m3是最低位
float b2f(float m0, float m1, float m2, float m3)
        // 求符号位
        float sig = 1;
        if (m3 >= 128.0f)
            sig = -1.0f;

        float jie = 0f;
        if (m3 >= 128.0f)
            jie = m3 - 128.0f;
            jie = m3;
        jie = jie * 2.0f;
        if (m2 >= 128.0f)
            jie += 1.0f;
        jie -= 127.0f;


        float tail = 0.0f;
        if (m2 >= 128.0f)
            m2 -= 128.0f;
        tail = m0 + (m1 + m2 * 256.0f) * 256.0f;
        tail = (tail) / 8388608;   //   8388608 = 2^23

        float f = sig * Mathf.Pow(2.0f, jie) * (1 + tail);

        return f;


v2f vert (appdata v,uint vid:SV_VertexID)
                float animMap_xx = vid*3 * _AnimMap_TexelSize.x + _AnimMap_TexelSize.x / 2;
                float animMap_xy = (vid*3+1) * _AnimMap_TexelSize.x + _AnimMap_TexelSize.x / 2;
                float animMap_xz = (vid*3+2) * _AnimMap_TexelSize.x + _AnimMap_TexelSize.x / 2;
                int curFrame = int(_FrameTime %_AnimFrameCount);
                float animMap_y = (curFrame + 0.5) * _AnimMap_TexelSize.y;
                float4 pos_x = tex2Dlod(_AnimMap, float4(animMap_xx, animMap_y, 0, 0));
                float4 pos_y = tex2Dlod(_AnimMap, float4(animMap_xy, animMap_y, 0, 0));
                float4 pos_z = tex2Dlod(_AnimMap, float4(animMap_xz, animMap_y, 0, 0));
                float4 pos;
                pos.x = b2f(pos_x.x *255 , pos_x.y * 255, pos_x.z * 255, pos_x.w * 255) ;
                pos.y = b2f(pos_y.x *255 , pos_y.y * 255, pos_y.z * 255, pos_y.w * 255) ;
                pos.z = b2f(pos_z.x*255 , pos_z.y * 255, pos_z.z * 255, pos_z.w * 255) ;
                pos.w =1;
                v2f o;
                o.vertex = UnityObjectToClipPos(pos);

                o.uv = v.uv;
                return o;

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