ITextSceneNode and setViewPort

[tehsilly]

Probably doing something pretty dumb here, but bear with me please.

I'm trying to render an ITextSceneNode in a viewport that's smaller than the full resolution of the window.

When I render an ITextSceneNode without calling setViewPort, it works perfectly and renders where I expect it to. However, if I call setViewPort first, the text renders in an unexpected location. I am rendering a billboard as well, and that renders where I expect.

Anyone able to let me know what's going on here?

Here are some screenshots of what I'm getting.
Without the setViewPort call:


With the setViewPort call (I set the text to white because it shows up more clearly here; I would very much like the text to be in the white square):


The offending line is commented out in the following code.

Code: Select all

	IBillboardSceneNode * bnode = smgr->addBillboardSceneNode(
		0,dimension2d<f32>(32,32),core::vector3df(0,0,10));
	bnode->setMaterialFlag(video::EMF_LIGHTING, false);
	bnode->setMaterialType(video::EMT_TRANSPARENT_ALPHA_CHANNEL);
	bnode->setMaterialTexture(0, driver->getTexture("../media/textures/waypoint.png"));

	smgr->addTextSceneNode(guienv->getBuiltInFont(),
		L"TEST",
		video::SColor(255,255,255,255), bnode);

	smgr->addCameraSceneNode(0, vector3df(0,30,-40), vector3df(0,5,0));

	while(device->run())
	{
		driver->beginScene(true, true, SColor(255,100,101,140));
		//driver->setViewPort(rect<s32>(0,0,640/2,480/2));
		smgr->drawAll();
		driver->endScene();
	}

[Dorth]

Seems to have been scaled twice...

[tehsilly]

Yep

[bitplane]

Bug added to tracker so it doesn't get lost.

[hybrid]

Ok, found the actual reason, but I'm not sure how to solve it. The problem is not a double scale, but a wrong position calculation. The text node is rendered as 2D, but gets its position from the 3d coords of the scene node. When using a viewport, the conversion from 3d position to screen coord returns an absolute screen position. When rendering directly at this position, the viewport is still applied and the text is rendered too far to the outsides (in this case at w/4,h/4 instead of w/2,h/2). When disabling the viewport and rendering at the position, this would work again. But I guess that we need to change the screen coord calculation to return proper coords for rendering into the actual viewport. Not sure what will break by this, though.
Any comment appreciated.