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Texture UV problems

Started by Laroche Jan 10, 2003 at 11:33 AM 7 replies 500+ views

Original Post

Jan 10, 2003 at 11:33 AM

Whats wrong with these Texture UV''s? I think I may have gotten them backwords. It is for a quad made up of 2 triangles in clockwise order:

  
	Quad[0].Position.x = 0;
	Quad[0].Position.y = Size;
	Quad[0].TextureUV.x = 0;
	Quad[0].TextureUV.y = 1.0f;

	Quad[1].Position.x = 0;
	Quad[1].Position.y = 0;
	Quad[1].TextureUV.x = 0;
	Quad[1].TextureUV.y = 0;

	Quad[2].Position.x = Size;
	Quad[2].Position.y = Size;
	Quad[2].TextureUV.x = 1.0f;
	Quad[2].TextureUV.y = 1.0f;

	Quad[3].Position.x = Size;
	Quad[3].Position.y = Size;
	Quad[3].TextureUV.x = 1.0f;
	Quad[3].TextureUV.y = 1.0f;

	Quad[4].Position.x = 0;
	Quad[4].Position.y = 0;
	Quad[4].TextureUV.x = 0;
	Quad[4].TextureUV.y = 0;

	Quad[5].Position.x = Size;
	Quad[5].Position.y = 0;
	Quad[5].TextureUV.x = 1.0f;
	Quad[5].TextureUV.y = 0;

The texture is loading find and setting fine but all I see it black on the quad when it gets rendered. These are pre-transformed verts, and all the colors are pure white (renders as a white square with no texture).

aker_jus

Jan 10, 2003 at 11:37 AM

Why dont you try to use this for creating your code?
pseudocode:
x[0] = x1;
y[0] = y1;
x[1] = x2;
y[1] = y1;
x[2] = x1;
y[2] = y2;
x[3] = x2;
y[3] = y2;

And render them as strips, I dont have time now and this is a very quick thinking of me, so I might be wrong. Play with your values.

Laroche

Author

Laroche

Jan 10, 2003 at 11:51 AM

Im using triangle lists in my program right now, and I'm not interested in switching to strips because of the way everything is set up to render in batches. I've done it that way before on a test program, however.

Ok, I've been fooling around the UV coords for a while now and still nothing shows up except a black quad. I've checked my Loading function and its working fine, SetTexture is working fine, what else could it be?

[edited by - laroche on January 10, 2003 4:45:24 PM]

DrunkenHyena

Jan 10, 2003 at 4:25 PM

I would guess that your Texture Stage States are wrong. Can you post what you''re setting them to?

Stay Casual,

Ken
Drunken Hyena

Laroche

Author

Laroche

Jan 10, 2003 at 5:35 PM

Texture loading code:

  
void CTexture::Load(char *Filename)
{
	D3DXCreateTextureFromFileEx(pd3ddev, Filename, 0, 0, 0, 0,
                            D3DFMT_A8R8G8B8, D3DPOOL_MANAGED, D3DX_DEFAULT,
                            D3DX_DEFAULT , 0, NULL, NULL, &pTexture);
}

And.. that''s it. I call SetTexture after it every frame, and then render. My normally white quad shows up as a black quad instead.

Laroche

Author

Laroche

Jan 11, 2003 at 10:27 PM

noone knows?

DrunkenHyena

Jan 12, 2003 at 3:13 AM

Try:
device->SetTextureStageState(0,D3DTSS_COLOROP,D3DTOP_SELECTARG1);
device->SetTextureStageState(0,D3DTSS_COLORARG1,D3DTA_TEXTURE);

Stay Casual,

Ken
Drunken Hyena

Laroche

Author

Laroche

Jan 12, 2003 at 2:11 PM

hmmm nothing at all... its really weird

Laroche

Author

Laroche

Jan 14, 2003 at 9:30 PM

sorry if i seem pushy to bump, but I just cant figure this out, and it's such a silly problem i don't know why it isn't working. I've put error checking everywhere, and everything seems fine. The weird thing is that my quad apparently is drawing only the most top-left pixel in the texture. Why would it do that?

EDIT: I FIXED IT!!! I can't belive how stupid my error was, i was forgetting to copy my verts uv coordinates into the vertex buffer. How could I be so stupid? Anyway, thanks for the help anyway

[edited by - laroche on January 14, 2003 10:33:48 PM]

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