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replacement for mesh.DrawSubset()

Started by jad_salloum Dec 17, 2005 at 4:17 AM 11 replies 3.4k views

Original Post

Dec 17, 2005 at 4:17 AM

hi guys is there any way to draw a mesh without using mesh.drawsubset ??? i think that it can be drawn using device.drawPrimitives but am not sure about it and how to do it ,with what mesh.drawsubset can be replaced ??

gymisi

Dec 17, 2005 at 4:22 AM

In C++:

	num_of_faces=mesh->GetNumFaces();num_of_vertices=mesh->GetNumVertices();mesh->GetIndexBuffer(&ib);mesh->GetVertexBuffer(&vb);fvf=mesh->GetFVF();fvfsize=D3DXGetFVFVertexSize(fvf);//renderg_device->SetFVF(fvf);g_device->SetIndices(ib);g_device->SetStreamSource(0,vb,0,fvfsize);g_device->DrawIndexedPrimitive(D3DPT_TRIANGLELIST,0,0,num_of_vertices,0,num_of_faces);

msdn: In C#

jad_salloum

Dec 17, 2005 at 4:37 AM

thanx for ur reply , look i am converting it to c# but there is no mesh.getFVF

do u know with what i can replace these lines ?
fvf=mesh->GetFVF();
fvfsize=D3DXGetFVFVertexSize(fvf);
g_device->SetFVF(fvf);

Muhammad Haggag

Dec 17, 2005 at 5:02 AM

Lookup Mesh.VertexFormat and Mesh.Declaration.

jad_salloum

Dec 17, 2005 at 5:48 AM

this is my source but i am not getting any thing on the screen when i run the game please tell me where is the error in it

	device.Transform.World = AllMatrix;					///mesh is the MeshContainer				ExtendedMaterial[] materials = mesh.GetMaterials();				for (int i = 0; i < materials.Length; ++i)				{					device.Material = materials.Material3D;					device.SetTexture(0, mesh.GetTextures());				//	mesh.MeshData.Mesh.DrawSubset(i);								int numFaces = mesh.MeshData.Mesh.NumberFaces;					int numVertexs = mesh.MeshData.Mesh.NumberVertices;					IndexBuffer ib = mesh.MeshData.Mesh.IndexBuffer;					VertexBuffer vb = mesh.MeshData.Mesh.VertexBuffer;					VertexFormats fvf= mesh.MeshData.Mesh.VertexFormat;					device.VertexFormat=fvf;					device.Indices=ib;					device.SetStreamSource(0,vb,0);					device.DrawIndexedPrimitives(PrimitiveType.TriangleList,0,0,numVertexs,0,numFaces);

}

DrGUI

Dec 17, 2005 at 10:40 AM

Did it work before, with DrawSubset? (to make sure that your matrices etc are set correctly)

jollyjeffers

Dec 17, 2005 at 10:49 AM

Your code wont properly work for a mesh with more than 1 material [smile]

For each material you're drawing the entire mesh - so for multiple materials you'll basically get a complete mess where it attempts to combine all the materials together.

You need to customize the draw call such that it only renders the correct part for that subset. That is, you need to examine the attribute table.

I'm not a C# programmer, so I don't know exactly what it'll look like... but try Mesh.GetAttributeTable() to get an array of AttributeRange structures. For each subset, you need to use the corresponding values from the AttributeRange.

hth
Jack

jad_salloum

Dec 17, 2005 at 12:41 PM

ya it works if i use mesh.drawsubset .

Quote:

For each material you're drawing the entire mesh - so for multiple materials you'll basically get a complete mess where it attempts to combine all the materials together.

ya i didnot pay attention to this material error but should't it draw it with messy material ?? at least something should appear on the screen

Quote:

you need to examine the attribute table

i didnot work with it before is there any SDK or any sample that demonstrates this tecnique ?

rate +++ for u guys

jad_salloum

Dec 18, 2005 at 5:29 AM

is there any other advice ??

jollyjeffers

Dec 18, 2005 at 7:29 AM

Have you tried using the debug runtimes? I can't see any mention of that in the thread?

If you get the params to DIP() wrong then it's likely to ignore the whole call - thus not rendering anything. If this is the case you'll often get 100's if not 1000's of messages from the debug runtime screaming-and-shouting about what it doesn't like [smile]

I'm running under Vista right now which doesn't pick up my RAID array, but when I get back to XP I'll see about digging up my re-implementation of DrawSubset() - it's in C++, but it should be trivial enough to convert.

hth
Jack

jollyjeffers

Dec 18, 2005 at 7:45 AM

LPDIRECT3DVERTEXBUFFER9 pVB = NULL;LPDIRECT3DINDEXBUFFER9  pIB = NULL;g_pMesh->GetVertexBuffer( &pVB );g_pMesh->GetIndexBuffer( &pIB );DWORD attrSize = 0;g_pMesh->GetAttributeTable( NULL, &attrSize );D3DXATTRIBUTERANGE *pAttr = new D3DXATTRIBUTERANGE[ attrSize ];g_pMesh->GetAttributeTable( pAttr, &attrSize );// Configure the deviceg_pd3dDevice->SetFVF( g_pMesh->GetFVF() );g_pd3dDevice->SetStreamSource( 0, pVB, 0, D3DXGetFVFVertexSize( g_pMesh->GetFVF() ) );g_pd3dDevice->SetIndices( pIB );for( int i = 0; i < g_dwNumMaterials; i++ ){    g_pd3dDevice->DrawIndexedPrimitive( D3DPT_TRIANGLELIST,                                         0,//BaseVertexIndex                                        pAttr.VertexStart, //MinIndex                                        pAttr.VertexCount,//NumVertices                                        pAttr.FaceStart * 3, //StartIndex                                        pAttr.FaceCount //NumPrimitives                                      );}

hth
Jack

jad_salloum

Dec 18, 2005 at 8:00 AM

thanks alot man i will try to convert it

TheMaskedFace

Dec 20, 2005 at 4:35 PM

when I try to invert it to c#, I can not see anything on render screen

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