Meshbuilder

Started by Anonymous Poster_Anonymous Poster_*, Aug 12 1999 07:36 AM

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#1 Anonymous Poster_Anonymous Poster_* Guests - Reputation:

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Posted 12 August 1999 - 07:36 AM

Hello,

I'm having a little difficulty using the IDirect3DRMMeshbuilder's GetVertices function. When I use it, I check the HRESULT return value and apparently it tells me I've "Passed a Bad Value". Actually I'm using the the DirectX5 SDK (not 6, since 6s GetVertices function has severly been changed).

I'm not sure what's wrong. Here's the code:

DWORD *vcount;
D3DVECTOR *vertices;
DWORD *ncount;
D3DVECTOR *normals;
DWORD *faceDataSize;

MESHSTRUCT zmeshstruct;
HRESULT myresult;

myresult = mesh->GetVertices(cvcount, xcvertices, ncount, normals, faceDataSize, NULL);

Now, I know that faceDataSize can't be NULL. But if I pass NULL as the last parameter (which would be the faceData), the function returns the DataSize in the faceDataSize variable. Besides, ALL I'M TRYING TO DO IS GET VERTEX POSITIONS! I don't want normals or vertex counts or facedata, just positions (why does it hafta be so damn hard?).

If anyone could help me, it would be greatly appreciated.

Thanks alot,

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#2 Anonymous Poster_Anonymous Poster_* Guests - Reputation:

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Posted 11 August 1999 - 06:05 PM

Oohh.

You're using RealMode...
ugh!
Good Luck

-DeadLine

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#3 Shinkage Members - Reputation: 586

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Posted 12 August 1999 - 07:36 AM

Um, first off it appears that you are calling the GetVertices function from a Direct3DRMMesh interface, not MeshBuilder. Whatever the case, both of these functions have to be called in two steps--one to retrieve the vertex count and one to retrieve the vertices. Also, it's importatant to remember to allocate memory properly.

// Direct3DRMMeshBuilder
DWORD vertexcount;
D3DVECTOR *vertices;

MeshBuilder->GetVertices( 0, &vertexcount, NULL );
vertices = new D3DVECTOR[vertexcount];
MeshBuilder->GetVertices( 0, &vertexcount, vertices );

// Direct3DRMMesh
// This version is a little more complicated
// as you have to call it for every group in
// the mesh.

// D3DRMGROUPINDEX i - set to current group
DWORD vertexcount, datasize;
D3DRMVERTEX *vertices;

Mesh->GetGroup( i, &vertexcount, NULL, NULL, &datasize, NULL );
vertices = new D3DRMVERTEX[vertexcount];
Mesh->GetVertices( i, 0, vertexcount, vertices );

Personally, I would suggest coding your own geometry engine in Immediate Mode, as it is almost infinitely preferable to Retained Mode.

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