C++ (Cpp) DetIJ Examples

Example #1

File: math3d.cpp Project: Christoopher/FLIP3D

////////////////////////////////////////////////////////////////////////////
///
// Invert matrix
void m3dInvertMatrix44(M3DMatrix44d mInverse, const M3DMatrix44d m)
	{
	int i, j;
	double det, detij;

	// calculate 4x4 determinant
	det = 0.0;
	for (i = 0; i < 4; i++)
		{
		det += (i & 0x1) ? (-m[i] * DetIJ(m, 0, i)) : (m[i] * DetIJ(m, 0,i));
		}
	det = 1.0 / det;

	// calculate inverse
	for (i = 0; i < 4; i++)
		{
		for (j = 0; j < 4; j++)
			{
			detij = DetIJ(m, j, i);
			mInverse[(i*4)+j] = ((i+j) & 0x1) ? (-detij * det) : (detij *det); 
			}
		}
	}

Example #2

File: MatrixMath.cpp Project: esligh/opengl_ncu3d

////////////////////////////////////////////////////////////////////////////
///
// Invert matrix
void gltInvertMatrix(const GLTMatrix m, GLTMatrix mInverse)
    {
    int i, j;
    float det, detij;

    // calculate 4x4 determinant
    det = 0.0f;
    for (i = 0; i < 4; i++)
        {
        det += (i & 0x1) ? (-m[i] * DetIJ(m, 0, i)) : (m[i] * DetIJ(m, 0,i));
        }
    det = 1.0f / det;

    // calculate inverse
    for (i = 0; i < 4; i++)
        {
        for (j = 0; j < 4; j++)
            {
            detij = DetIJ(m, j, i);
            mInverse[(i*4)+j] = ((i+j) & 0x1) ? (-detij * det) : (detij *det); 
            }
        }
    }