Copy irrlichtmt to <root>/irr/

irr/src/CSceneCollisionManager.cpp

@@ -0,0 +1,74 @@
+// Copyright (C) 2002-2012 Nikolaus Gebhardt
+// This file is part of the "Irrlicht Engine".
+// For conditions of distribution and use, see copyright notice in irrlicht.h
+
+#include "CSceneCollisionManager.h"
+#include "ICameraSceneNode.h"
+#include "SViewFrustum.h"
+
+#include "os.h"
+#include "irrMath.h"
+
+namespace irr
+{
+namespace scene
+{
+
+//! constructor
+CSceneCollisionManager::CSceneCollisionManager(ISceneManager *smanager, video::IVideoDriver *driver) :
+		SceneManager(smanager), Driver(driver)
+{
+#ifdef _DEBUG
+	setDebugName("CSceneCollisionManager");
+#endif
+
+	if (Driver)
+		Driver->grab();
+}
+
+//! destructor
+CSceneCollisionManager::~CSceneCollisionManager()
+{
+	if (Driver)
+		Driver->drop();
+}
+
+//! Returns a 3d ray which would go through the 2d screen coordinates.
+core::line3d<f32> CSceneCollisionManager::getRayFromScreenCoordinates(
+		const core::position2d<s32> &pos, const ICameraSceneNode *camera)
+{
+	core::line3d<f32> ln(0, 0, 0, 0, 0, 0);
+
+	if (!SceneManager)
+		return ln;
+
+	if (!camera)
+		camera = SceneManager->getActiveCamera();
+
+	if (!camera)
+		return ln;
+
+	const scene::SViewFrustum *f = camera->getViewFrustum();
+
+	core::vector3df farLeftUp = f->getFarLeftUp();
+	core::vector3df lefttoright = f->getFarRightUp() - farLeftUp;
+	core::vector3df uptodown = f->getFarLeftDown() - farLeftUp;
+
+	const core::rect<s32> &viewPort = Driver->getViewPort();
+	core::dimension2d<u32> screenSize(viewPort.getWidth(), viewPort.getHeight());
+
+	f32 dx = pos.X / (f32)screenSize.Width;
+	f32 dy = pos.Y / (f32)screenSize.Height;
+
+	if (camera->isOrthogonal())
+		ln.start = f->cameraPosition + (lefttoright * (dx - 0.5f)) + (uptodown * (dy - 0.5f));
+	else
+		ln.start = f->cameraPosition;
+
+	ln.end = farLeftUp + (lefttoright * dx) + (uptodown * dy);
+
+	return ln;
+}
+
+} // end namespace scene
+} // end namespace irr