void ShaderRenderer::screenPosToDirection(const Common::Point screen, float &pitch, float &heading) {
  double x, y, z;

  x = screen.x;
  y = kOriginalHeight - screen.y;
  z = 0.9f;

  const Math::Vector2d tl = _viewport.getTopLeft();
  x = 2 * double(x - tl.getX()) / _viewport.getWidth() - 1.0f;
  y = 2 * double(y - tl.getY()) / _viewport.getHeight() - 1.0f;
  z = 2 * z - 1.0f;

  // Screen coords to 3D coords
  Math::Vector4d point = Math::Vector4d(x, y, z, 1.0f);
  point = _mvpMatrix * point;

  // 3D coords to polar coords
  Math::Vector3d v = Math::Vector3d(point.x(), point.y(), point.z());
  v.normalize();

  Math::Vector2d horizontalProjection = Math::Vector2d(v.x(), v.z());
  horizontalProjection.normalize();

  pitch = 90 - Math::Angle::arcCosine(v.y()).getDegrees();
  heading = Math::Angle::arcCosine(horizontalProjection.getY()).getDegrees();

  if (horizontalProjection.getX() > 0.0)
    heading = 360 - heading;
}
Exemple #2
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void Lua_V2::WorldToScreen() {
	lua_Object xObj = lua_getparam(1);
	lua_Object yObj = lua_getparam(2);
	lua_Object zObj = lua_getparam(3);
	if (!lua_isnumber(xObj) || !lua_isnumber(yObj) || !lua_isnumber(zObj)) {
		lua_pushnumber(0.0);
		lua_pushnumber(0.0);
		return;
	}

	float x = lua_getnumber(xObj);
	float y = lua_getnumber(yObj);
	float z = lua_getnumber(zObj);
	Math::Vector3d pos = Math::Vector3d(x, y, z);

	const Set::Setup *setup = g_emi->getCurrSet()->getCurrSetup();
	const Math::Vector3d interest = setup->_interest;
	const float roll = setup->_roll;
	const Math::Quaternion quat = Math::Quaternion(interest.x(), interest.y(), interest.z(), roll);
	Math::Matrix4 view = quat.toMatrix();
	view.transpose();

	pos -= setup->_pos;
	pos = view.getRotation() * pos;
	pos.z() = -pos.z();

	Math::Matrix4 proj = GfxBase::makeProjMatrix(setup->_fov, setup->_nclip, setup->_fclip);
	proj.transpose();
	Math::Vector4d screen = proj * Math::Vector4d(pos.x(), pos.y(), pos.z(), 1.0);
	screen /= screen.w();

	lua_pushnumber((screen.x() + 1) * 320);
	lua_pushnumber((1 - screen.y()) * 240);
}