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When attempting to draw a line in 3D space with D3DPT_LINELIST, then Direct3D gives me an error about an invalid vertex declaration, saying that it cannot be converted to an FVF. I am using the same vertex declaration and shader/stream setup as for my D3DPT_TRIANGLELIST rendering which works absolutely correctly.

How can I use D3DPT_LINELIST to render some lines in 3D space?

Edit: Here's my raw Draw call.

D3DCALL(device->SetStreamSource(1, PerBoneBuffer.get(), 0, sizeof(PerInstanceData)));
D3DCALL(device->SetStreamSourceFreq(1, D3DSTREAMSOURCE_INSTANCEDATA | 1));
D3DCALL(device->SetStreamSource(0, LineVerts, 0, sizeof(D3DXVECTOR3)));
D3DCALL(device->SetStreamSourceFreq(0, D3DSTREAMSOURCE_INDEXEDDATA | lines.size()));
D3DCALL(device->SetIndices(LineIndices));
PerInstanceData* data;
std::vector<Wide::Render::Line*> lines_vec(lines.begin(), lines.end());
D3DCALL(PerBoneBuffer->Lock(0, lines.size() * sizeof(PerInstanceData), reinterpret_cast<void**>(&data), D3DLOCK_DISCARD));
std::for_each(lines.begin(), lines.end(), [&](Wide::Render::Line* ptr) {
    data->Color = D3DXColor(ptr->Colour);
    D3DXMATRIXA16 Translate, Scale, Rotate;
    D3DXMatrixTranslation(&Translate, ptr->Start.x, ptr->Start.y, ptr->Start.z);
    D3DXMatrixScaling(&Scale, ptr->Scale, 1, 1);
    D3DXMatrixRotationQuaternion(&Rotate, &D3DQuaternion(ptr->Rotation));
    data->World = Scale * Rotate * Translate;
});
D3DCALL(PerBoneBuffer->Unlock());
D3DCALL(device->DrawIndexedPrimitive(D3DPRIMITIVETYPE::D3DPT_LINELIST, 0, 0, 2, 0, 1));

Here's my vertex declaration:

D3DVERTEXELEMENT9 BasicMeshVertices[] = {
    {0, 0, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_POSITION, 0},
    {1, 0, D3DDECLTYPE_FLOAT4, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 0},
    {1, 16, D3DDECLTYPE_FLOAT4, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 1},
    {1, 32, D3DDECLTYPE_FLOAT4, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 2},
    {1, 48, D3DDECLTYPE_FLOAT4, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 3},
    {1, 64, D3DDECLTYPE_FLOAT4, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_COLOR, 0},
    D3DDECL_END()
};

The LineIndices are just 0, 1 and the LineVerts are just {0,0,0} and {1,0,0}, to represent a unit 3D line along the X axis.

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    \$\begingroup\$ Please, give us some source code ;) \$\endgroup\$ – zacharmarz Mar 28 '12 at 5:05
  • \$\begingroup\$ @zacharmarz: Oops, my mistake! \$\endgroup\$ – DeadMG Mar 28 '12 at 11:59
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Turns out I just forgot to set the shader to the device.

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