GLU.gluUnProject返回Java LWJGL中的所有NaN

Question

public Vector3f getClickPos(int x, int y)
{
    IntBuffer viewport = BufferUtils.createIntBuffer(16);
    FloatBuffer modelview = BufferUtils.createFloatBuffer(16);
    FloatBuffer projection = BufferUtils.createFloatBuffer(16);
    float winX, winY, winZ;

    GL11.glGetFloat(GL11.GL_MODELVIEW_MATRIX, modelview);
    GL11.glGetFloat(GL11.GL_PROJECTION_MATRIX, projection);
    GL11.glGetInteger(GL11.GL_PROJECTION_MATRIX, viewport);

    winX = (float)x;
    winY = (float)y;

    FloatBuffer winZBuffer = BufferUtils.createFloatBuffer(1);
    GL11.glReadPixels( (int)winX, (int)winY, 1, 1, GL11.GL_DEPTH_COMPONENT, GL11.GL_FLOAT, winZBuffer);
    winZ = winZBuffer.get(0);

    FloatBuffer position = BufferUtils.createFloatBuffer(3);
    GLU.gluUnProject( winX, winY, winZ, modelview, projection, viewport, position);

    return new Vector3f(position.get(0), position.get(1), position.get(2));
}

出于某种原因，此代码始终返回所有位置的NaN值。我已经检查了，模型，投影和视图矩阵不是空的，也不是WinZ。该函数也返回true。

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