Vector UTIL_GetMouseAim( C_HL2WarsPlayer *pPlayer, int x, int y )
{
Vector forward;
// Remap x and y into -1 to 1 normalized space
float xf, yf;
xf = ( 2.0f * x / (float)(ScreenWidth()-1) ) - 1.0f;
yf = ( 2.0f * y / (float)(ScreenHeight()-1) ) - 1.0f;
// Flip y axis
yf = -yf;
const VMatrix &worldToScreen = engine->WorldToScreenMatrix();
VMatrix screenToWorld;
MatrixInverseGeneral( worldToScreen, screenToWorld );
// Create two points at the normalized mouse x, y pos and at the near and far z planes (0 and 1 depth)
Vector v1, v2;
v1.Init( xf, yf, 0.0f );
v2.Init( xf, yf, 1.0f );
Vector o2;
// Transform the two points by the screen to world matrix
screenToWorld.V3Mul( v1, pPlayer->Weapon_ShootPosition() ); // ray start origin
screenToWorld.V3Mul( v2, o2 ); // ray end origin
VectorSubtract( o2, pPlayer->Weapon_ShootPosition(), forward );
forward.NormalizeInPlace();
return forward;
}
void CEngineTool::CreatePickingRay( const CViewSetup &viewSetup, int x, int y, Vector& org, Vector& forward )
{
// Remap x and y into -1 to 1 normalized space
float xf, yf;
xf = ( 2.0f * (float)x / (float)viewSetup.width ) - 1.0f;
yf = ( 2.0f * (float)y / (float)viewSetup.height ) - 1.0f;
// Flip y axis
yf = -yf;
VMatrix worldToScreen;
GetWorldToScreenMatrixForView( viewSetup, &worldToScreen );
VMatrix screenToWorld;
MatrixInverseGeneral( worldToScreen, screenToWorld );
// Create two points at the normalized mouse x, y pos and at the near and far z planes (0 and 1 depth)
Vector v1, v2;
v1.Init( xf, yf, 0.0f );
v2.Init( xf, yf, 1.0f );
Vector o2;
// Transform the two points by the screen to world matrix
screenToWorld.V3Mul( v1, org ); // ray start origin
screenToWorld.V3Mul( v2, o2 ); // ray end origin
VectorSubtract( o2, org, forward );
forward.NormalizeInPlace();
}
