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using System;
using MonoMac.OpenGL;
namespace GLFullScreen
{
public class Geometry {
// This creates a symmetric frustum.
// It converts to 6 params (l, r, b, t, n, f) for glFrustum()
// from given 4 params (fovy, aspect, near, far)
public static void Perspective (double fovY, double aspectRatio, double front, double back)
{
const double DEG2RAD = Math.PI / 180;
// tangent of half fovY
double tangent = Math.Tan (fovY/2 * DEG2RAD);
// half height of near plane
double height = front * tangent;
// half width of near plane
double width = height * aspectRatio;
// params: left, right, bottom, top, near, far
GL.Frustum(-width, width, -height, height, front, back);
}
}
}
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