Vertex Declarations?

Everything is correct with that declaration, except for the offset of the third element. Since a float2 is 8 bytes, it should be 12 + 8 = 20, not 24.

Also your third entry is D3DDECLTYPE_FLOAT2, but there is only 1 float.

Good morning Shaqdx,
How are you doing?

The Problem
Just to reiterate the previous poster's point. Circlesoft and JohnBolton.
Vertex Declaration: Offsets and size of floats.

The Solution
The Size of a float:
a float is 4 bytes in size.
2 floats is 2 x 4 bytes.
so float2 is 8 bytes.

The second parameter of a vertex declaration: Offset
Offset from the beginning of the vertex data to the data associated with the particular data type.

The offset should be the offset from the beginning of the vertex element to the beginning of the data.

So your vertex declaration should be
e.g.
const D3DVERTEXELEMENT9 declQuad[4] =
{
{0, 0, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_POSITION, 0},

{0, 12, D3DDECLTYPE_FLOAT2, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 0},

{0, 20, D3DDECLTYPE_FLOAT2, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 1},

D3DDECL_END()
};

Custom Vertex Structure
Your structure should reflect the vertex declaration.
You should have 1 set of postitional coordinates and 2 sets of texture coordinates.
struct QUADCUSTOMVERTEX
{
D3DXVECTOR3 position;
float u1, v1;
float u2, v2;
};
QuadFVF = D3DFVF_XYZ|D3DFVF_TEX2;

I hope this helps. Thanks to circlesoft and johnbolton for their quick replies.

EDIT: Fixed the TEX2 vertex format. Sorry about that guys, I wasn't paying attention.

[Edited by - Armadon on September 27, 2005 12:01:23 PM]

That's brilliant!

Thanks everyone.

Quote:

Original post by Armadon QuadFVF = D3DFVF_XYZ|D3DFVF_TEX1|D3DFVF_TEX2;

This should just be D3DFVF_XYZ|D3DFVF_TEX2. The way it works out you've specified the equivilent of TEX3.