public Cross ( |
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vector | ||
리턴 | Mono.Simd.Vector4f |
/// <summary> /// /// </summary> /// <param name="at">Looking direction, must be a normalized vector</param> /// <param name="upDirection">Up direction, must be a normalized vector</param> public void LookDirection(Vector3f at, Vector3f upDirection) { // The two parameters cannot be parallel Vector3f left = upDirection.Cross(ref at); if (left == Vector3f.Zero) { // Prevent left from being zero at.X += 0.01f; at.Normalize(); left = upDirection.Cross(ref at); } left.Normalize(); xAxis = at; yAxis = left; zAxis = at.Cross(ref left); }
public void FromWorld(Vector3f position, Vector3f forward, Vector3f up) { // Normalize forward vector forward.Normalize(); // Calculate right vector Vector3f right = forward.Cross(ref up); right.Normalize(); // Recalculate up vector up = right.Cross(ref forward); up.Normalize(); R0 = new Vector4f(right.X, right.Y, right.Z, 0.0f); R1 = new Vector4f(up.X, up.Y, up.Z, 0.0f); R2 = new Vector4f(-forward.X, -forward.Y, -forward.Z, 0.0f); R3 = new Vector4f(position.X, position.Y, position.Z, 1.0f); }