D3DXSimplifyMesh Function

Generates a simplified mesh using the provided weights that come as close as possible to the given MinValue.

Syntax

HRESULT D3DXSimplifyMesh(      

    LPD3DXMESH pMesh,
    CONST DWORD *pAdjacency,
    CONST LPD3DXATTRIBUTEWEIGHTS pVertexAttributeWeights,
    CONST FLOAT *pVertexWeights,
    DWORD MinValue,
    DWORD Options,
    LPD3DXMESH *ppMesh
);

Parameters

pMesh

[in] Pointer to an ID3DXMesh interface, representing the source mesh.

pAdjacency

[in] Pointer to an array of three DWORDs per face that specify the three neighbors for each face in the mesh to be simplified.

pVertexAttributeWeights

[in] Pointer to a D3DXATTRIBUTEWEIGHTS structure, containing the weight for each vertex component. If this parameter is set to NULL, a default structure is used. See Remarks.

pVertexWeights

[in] Pointer to an array of vertex weights. If this parameter is set to NULL, all vertex weights are set to 1.0.

MinValue

[in] Number of vertices or faces, depending on the flag set in the Options parameter, by which to simplify the source mesh.

Options

[in] Specifies simplification options for the mesh. One of the flags in D3DXSimplifyMesh can be set.

ppMesh

[out] Address of a pointer to an ID3DXMesh interface, representing the returned simplification mesh.

Return Value

If the function succeeds, the return value is D3D_OK.

If the function fails, the return value can be one of the following values.

D3DERR_INVALIDCALL	The method call is invalid. For example, a method's parameter may have an invalid value.
D3DXERR_INVALIDDATA	The data is invalid.
E_OUTOFMEMORY	Microsoft?Direct3D?could not allocate sufficient memory to complete the call.

Remarks

This function generates a mesh that has MinValue vertices or faces.

If the simplification process cannot reduce the mesh to MinValue, the call still succeeds because MinValue is a desired minimum, not an absolute minimum.

If pVertexAttributeWeights is set to NULL, the following values are assigned to the default D3DXATTRIBUTEWEIGHTS structure.

D3DXATTRIBUTEWEIGHTS AttributeWeights;

AttributeWeights.Position  = 1.0;
AttributeWeights.Boundary =  1.0;
AttributeWeights.Normal   =  1.0;
AttributeWeights.Diffuse  =  0.0;
AttributeWeights.Specular =  0.0;
AttributeWeights.Tex[8]   =  {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0};

This default structure is what most applications should use because it considers only geometric and normal adjustment. Only in special cases will the other member fields need to be modified.

Function Information

Header	d3dx9mesh.h
Import library	d3dx9.lib
Minimum operating systems	Windows 98