Function Ortho

engine/Poseidon/Graphics/Shadow/ShadowMath.cpp:169–183

}

Mat4 Ortho(float l, float r, float b, float t, float n, float f)
{
    Mat4 m;
    float rl = (r - l != 0.0f) ? (r - l) : 1e-6f;
    float tb = (t - b != 0.0f) ? (t - b) : 1e-6f;
    float fn = (f - n != 0.0f) ? (f - n) : 1e-6f;
    m.at(0, 0) = 2.0f / rl;
    m.at(1, 1) = 2.0f / tb;
    m.at(2, 2) = -1.0f / fn; // zero-to-one depth: near plane -> 0, far plane -> 1
    m.at(0, 3) = -(r + l) / rl;
    m.at(1, 3) = -(t + b) / tb;
    m.at(2, 3) = -n / fn;
    m.at(3, 3) = 1.0f;
    return m;
}

Mat4 Perspective(float fovYRadians, float aspect, float n, float f)
{