perspectiveNO function

List<double> perspectiveNO(List<double> out, double fovy, double aspect, double near, double? far,)

Generates a perspective projection matrix with the given bounds. The near/far clip planes correspond to a normalized device coordinate Z range of -1, 1, which matches WebGL/OpenGL's clip volume. Passing null/undefined/no value for far will generate infinite projection matrix.

@param {mat4} out mat4 frustum matrix will be written into @param {number} fovy Vertical field of view in radians @param {number} aspect Aspect ratio. typically viewport width/height @param {number} near Near bound of the frustum @param {number} far Far bound of the frustum, can be null or Infinity @returns {mat4} out

Implementation

List<double> perspectiveNO(List<double> out, double fovy, double aspect, double near, double? far) {
  final f = 1.0 / math.tan(fovy / 2);
  out[0] = f / aspect;
  out[1] = 0;
  out[2] = 0;
  out[3] = 0;
  out[4] = 0;
  out[5] = f;
  out[6] = 0;
  out[7] = 0;
  out[8] = 0;
  out[9] = 0;
  out[11] = -1;
  out[12] = 0;
  out[13] = 0;
  out[15] = 0;
  if (far != null && far != double.infinity) {
    final nf = 1 / (near - far);
    out[10] = (far + near) * nf;
    out[14] = 2 * far * near * nf;
  } else {
    out[10] = -1;
    out[14] = -2 * near;
  }
  return out;
}