生成一个立方体贴图（Cube Map）

最新推荐文章于 2025-04-14 16:33:16 发布

CoderIsArt

最新推荐文章于 2025-04-14 16:33:16 发布

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CC 4.0 BY-SA版权

分类专栏： C# 图像与图形处理文章标签：算法 sharpGL

本文链接：https://blog.youkuaiyun.com/zkmrobot/article/details/145762887

private bool GenerateNormalisationCubeMap()
        {
            var gl = openGLControl1.OpenGL;

            //  First we create space to hold the data for a single face.
            //  Each face is 32x32, and we need to store the R, G and B components of the color at each point.
            byte[] data = new byte[32 * 32 * 3];

            //  Some useful variables.
            int size = 32;
            float offset = 0.5f;
            float halfSize = 16.0f;
            Vertex tempVector = new Vertex();
            uint byteCounter = 0;

            //  Positive x.
            for (int j = 0; j < size; j++)
            {
                for (int i = 0; i < size; i++)
                {
                    tempVector.X = (halfSize);
                    tempVector.Y = (-(j + offset - halfSize));
                    tempVector.Z = (-(i + offset - halfSize));
                    tempVector.UnitLength();
                    tempVector = tempVector.GetPackedTo01();
                    data[byteCounter++] = (byte)(tempVector.X * 255f);
                    data[byteCounter++] = (byte)(tempVector.Y * 255f);
                    data[byteCounter++] = (byte)(tempVector.Z * 255f);
                }
            }

            //  Set the texture image.
            gl.TexImage2D(OpenGL.GL_TEXTURE_CUBE_MAP_POSITIVE_X,
                0, OpenGL.GL_RGBA8, 32, 32, 0, OpenGL.GL_RGB, OpenGL.GL_UNSIGNED_BYTE, data);

            //negative x
            byteCounter = 0;

            for (int j = 0; j < size; j++)
            {
                for (int i = 0; i < size; i++)
                {
                    tempVector.X = (-halfSize);
                    tempVector.Y = (-(j + offset - halfSize));
                    tempVector.Z = ((i + offset - halfSize));

                    tempVector.UnitLength();
                    tempVector = tempVector.GetPackedTo01();

                    data[byteCounter++] = (byte)(tempVector.X * 255f);
                    data[byteCounter++] = (byte)(tempVector.Y * 255f);
                    data[byteCounter++] = (byte)(tempVector.Z * 255f);
                }
            }
            gl.TexImage2D(OpenGL.GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
                            0, OpenGL.GL_RGBA8, 32, 32, 0, OpenGL.GL_RGB, OpenGL.GL_UNSIGNED_BYTE, data);

            //positive y
            b