三維平移

在三維齊次座標表示中，任意點P = (x, y, z)通過將平移距離tx, ty，和tz加到P的座標上而平移到位置P’= (x', y', z'):

typedef GLfloat Matrix4x4 [4][4];

/* Construct the 4 by 4 identity matrix.*/
void matrix4x4SetIdentity (Matrix4x4 matIdent4x4)
{
	GLint  row, col;
	for (row = 0; row < 4; row++)
		for (col = 0; col < 4; col++)
			matIdent4x4 [row][col] = (row == col);
}

void translate3D (GLfloat tx, GLfloat ty, GLfloat tz)
{
	Matrix4x4 matTransl3D;
	
	/* Initialize translation matrix to identity. */
	matrix4x4SetIdentity(matTransl3D);
	
	matTransl3D [0][3] = tx;
	matTransl3D [1][3] = ty;
	matTransl3D [2][3] = tz;
}