i had this problem where using drawprimitiveup produced primitives that had color problems. but when i changed to drawprimitive''s and vertex buffers, everything is fine. anybody have a reason for such a thing????

thanks for reply.
to ansqer your questions...

1) does the FVF make sense ?
Yes, i triple checked this...in fact, i didnt really have to touch this this when i used vertex buffers. everything else was practically untouched. so i know this isnt the issue.

2) does the FVF code match the vertex structure ?
yes it does.

3) are the elements of the vertex structure in the correct order (position, then normal, then colour, then texture coords) ?
I am using vertices that only have XYZ coordinates and a DIFFUSE color. and yes, they are defined and set in that order.

4) is the stride you pass correct for the structure (double check it!) ?
Now this is where I am unsure about. I dont know exactly what this means. What I pass for the stride information is this:

sizeof( CUSTOMVERTEX_UNTRANSFORMED )

where CUSTOMVERTEX_UNTRANSFORMED is D3DFVF_XYZ | D3DFVF_DIFFUSE.

5) check that you''ve used the correct data types in your vertex structure (i.e. that a colour comes out as a DWORD, not 3-4 floats!).
Is this again to double-check that my vertices are defined in proper order, XYZ first, DIFFUSE second?

6) check any SetStreamSource() etc type calls.
Before using vertex buffers i never made any calls to SetStreaSource(). Im not even sure what its for outside of vertex buffers.

where CUSTOMVERTEX_UNTRANSFORMED is D3DFVF_XYZ | D3DFVF_DIFFUSE.


untransformed?
D3DFVF_XYZRHW

, where:
float x,y,z;
float rhw; // 0
dword color;

.lick

quote:Original post by aker_jus
For the stride, you must pass a sizeof of your vertex structure, not your FVF.

he did it right


.lick

quote:Original post by Pipo DeClown
Original post by aker_jus
For the stride, you must pass a sizeof of your vertex structure, not your FVF.

he did it right

pipo: umm no he didn't...for the stride like aker_jus said u have to pass the sizeof your vertex structure and not the fvf

and for your reference pipo....his vertex format is untransformed....D3DFVF_XYZRHW is already transformed...


[edited by - SnakeHunta on May 1, 2003 9:18:32 AM]

DrawPrimitiveUP is buggy and slow, it should never be used and it should be deprecated from the DirectX API.

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Cuando miras al abismo el abismo te devuelve la mirada.
F. Nietzsche

Ok, I just figured out why i was experiencing some weird things.

I was defining my vertex buffer as a pointer in which i would dynamically allocate memory for it.
evidently, DX does not like that, even though it lets you do it.
so, i simply declared it with a predetermined length.
this works!