fromXRotation function
Creates a matrix from the given angle around the X axis This is equivalent to (but much faster than):
mat4.identity(dest);
mat4.rotateX(dest, dest, double rad);
@param {mat4} out mat4 receiving operation result @param {Number} rad the angle to rotate the matrix by @returns {mat4} out
Implementation
List<double> fromXRotation(List<double> out, double rad) {
final s = math.sin(rad);
final c = math.cos(rad);
// Perform axis-specific matrix multiplication
out[0] = 1;
out[1] = 0;
out[2] = 0;
out[3] = 0;
out[4] = 0;
out[5] = c;
out[6] = s;
out[7] = 0;
out[8] = 0;
out[9] = -s;
out[10] = c;
out[11] = 0;
out[12] = 0;
out[13] = 0;
out[14] = 0;
out[15] = 1;
return out;
}