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Downscaling sprite -> black screen

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I've tested out a scale thats smaller than 1.0f for the first time, and when I do so things won't get rendered. I'm using the lpd3dxsprite-interface. Well, according to the output of Nvidia PerfHUD (see attached screen). When applying a scale like 0.5f, the rendered geometry is reduced to a line oO. So obivously its no mipmapping-issue or anything like that.

Thats how I apply the scale:

void D3DSprite::DrawEx(LPDIRECT3DTEXTURE9 lpTexture, D3DXVECTOR3 vPosition, D3DXVECTOR3 vOrigin, RECT rSourceRect, D3DXVECTOR2 vScale, float fAngle)
//dummy variables to spare constructor calls
m_vDummyCenter.x = vOrigin.x;
m_vDummyCenter.y = vOrigin.y;
m_vDummyScaleCenter.x = vPosition.x;
m_vDummyScaleCenter.y = vPosition.y;
//apply transform
//draw the sprite
m_lpD3DSprite->Draw(lpTexture,&rSourceRect,&vOrigin,&vPosition,D3DCOLOR_ARGB(255, 255, 255, 255));

Is there anything obviously wrong with this? Upscaling works fine so I don't see why downscaling shouldn't.. Edited by The King2

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Try taking this into PIX and see what exactly is happening to the geometry. I see you have a scissor rect enabled, that could be clipping it, or your scale may end up evaluating to 0, or any of those matrices created by the transform could be evaluating to 0.0f. Good luck!

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Thanks for the hint,

the scaling indeed was 0, I noticed when playing around in PIX and setting both the X and Y scale to 0.5, now there wasn't even a line anymore. I defined the SetScale-method to accept an integer, so no wonder scale was 0.. problem solved :)

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