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OpenGL：如何在 OpenTK 中绘制立方体？

发布于 2024-10-24 17:36:58 字数 58 浏览 3 评论 0原文

glutWireCube()是C++中绘制立方体的函数，OpenTK中怎么样？使用任何函数来替换它吗？

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思念满溢 2024-10-31 17:36:58

该函数使用旧的固定函数管道绘制实体立方体，根据您的需要对其进行修改。
为了简洁起见，我将变量声明写在函数内，但如果您想要更高的性能，则应该将它们移出函数。我还建议重写该函数以使用 GL.DrawElements() 代替。

    private void DrawBox(float size)
    {
        float[,] n = new float[,]{
            {-1.0f, 0.0f, 0.0f},
            {0.0f, 1.0f, 0.0f},
            {1.0f, 0.0f, 0.0f},
            {0.0f, -1.0f, 0.0f},
            {0.0f, 0.0f, 1.0f},
            {0.0f, 0.0f, -1.0f}
        };
        int[,] faces = new int[,]{
            {0, 1, 2, 3},
            {3, 2, 6, 7},
            {7, 6, 5, 4},
            {4, 5, 1, 0},
            {5, 6, 2, 1},
            {7, 4, 0, 3}
        };
        float[,] v = new float[8,3];
        int i;

        v[0,0] = v[1,0] = v[2,0] = v[3,0] = -size / 2;
        v[4,0] = v[5,0] = v[6,0] = v[7,0] = size / 2;
        v[0,1] = v[1,1] = v[4,1] = v[5,1] = -size / 2;
        v[2,1] = v[3,1] = v[6,1] = v[7,1] = size / 2;
        v[0,2] = v[3,2] = v[4,2] = v[7,2] = -size / 2;
        v[1,2] = v[2,2] = v[5,2] = v[6,2] = size / 2;

        GL.Begin(BeginMode.Quads);
        for (i = 5; i >= 0; i--) {
            GL.Normal3(ref n[i, 0]);
            GL.Vertex3(ref v[faces[i, 0], 0]);
            GL.Vertex3(ref v[faces[i, 1], 0]);
            GL.Vertex3(ref v[faces[i, 2], 0]);
            GL.Vertex3(ref v[faces[i, 3], 0]);
        }
        GL.End();
    }

This function draws a solid cube using the old fixed function pipeline, modify it for your needs.
I've written the variable declarations inside the function for brevity but you should move them out of the function if you want more performance. I would also recommend rewriting the function to use GL.DrawElements() instead.

    private void DrawBox(float size)
    {
        float[,] n = new float[,]{
            {-1.0f, 0.0f, 0.0f},
            {0.0f, 1.0f, 0.0f},
            {1.0f, 0.0f, 0.0f},
            {0.0f, -1.0f, 0.0f},
            {0.0f, 0.0f, 1.0f},
            {0.0f, 0.0f, -1.0f}
        };
        int[,] faces = new int[,]{
            {0, 1, 2, 3},
            {3, 2, 6, 7},
            {7, 6, 5, 4},
            {4, 5, 1, 0},
            {5, 6, 2, 1},
            {7, 4, 0, 3}
        };
        float[,] v = new float[8,3];
        int i;

        v[0,0] = v[1,0] = v[2,0] = v[3,0] = -size / 2;
        v[4,0] = v[5,0] = v[6,0] = v[7,0] = size / 2;
        v[0,1] = v[1,1] = v[4,1] = v[5,1] = -size / 2;
        v[2,1] = v[3,1] = v[6,1] = v[7,1] = size / 2;
        v[0,2] = v[3,2] = v[4,2] = v[7,2] = -size / 2;
        v[1,2] = v[2,2] = v[5,2] = v[6,2] = size / 2;

        GL.Begin(BeginMode.Quads);
        for (i = 5; i >= 0; i--) {
            GL.Normal3(ref n[i, 0]);
            GL.Vertex3(ref v[faces[i, 0], 0]);
            GL.Vertex3(ref v[faces[i, 1], 0]);
            GL.Vertex3(ref v[faces[i, 2], 0]);
            GL.Vertex3(ref v[faces[i, 3], 0]);
        }
        GL.End();
    }

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