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D3DXVec3Project

Started by treeway Jul 31, 2006 at 5:39 PM 0 replies 2.4k views

Original Post

Jul 31, 2006 at 5:39 PM

Hi Im trying to render some text to the screen where an object apears in 3d space by using D3DXVec3Project() but im getting the wrong results:


base->D3dDevice->GetViewport(&vp);
D3DXVec3Project(&textPos,playerPosition,&vp,base->camera->getProjectionMatrix(),base->camera->getViewMatrix(),base->camera->getWorldMatrix());
		
sprintf(base->buffer,"CamDist: %f \n StrDist: %f \n FPS %d \n X %f Y %f Z %f",camDistance,storedDistace,base->getFPS(),textPos.x,textPos.y,textPos.z);
		base->renderText(base->buffer,textPos.x,textPos.y,D3DCOLOR_XRGB(0,0,0));
		test->setPosition(&textPos);

what could be wrong?

circlesoft

Jul 31, 2006 at 9:11 PM

That looks to be the correct usage, so check you input parameters:

(1) Does the GetViewport() call actually succeed? If you have a pure device, it will fail.

(2) Are the matrices correct? Check to see if they are still valid at this point in the frame.

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