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the TDx_Library
the TDx9_Library
- Description
The TDx_3DDevice::ComputeSphereVisibility() method will ascertain the viewport visibility of an array spheres.
The visibility calculation needs to invert the combined world, view or projection matrices.
If inversion of the combined matrix is not possible (ie: the determinant is 0), D3DERR_INVALIDMATRIX is returned.
If the method call fails, the OnError event will be triggered with one of the following values:
D3DERR_INVALIDMATRIX
DDERR_INVALIDOBJECT
DDERR_INVALIDPARAMS
- Parameters
Centers
The Centers parameter references an array of TD3DVector components defining the world space center of each sphere.
Radii
The Radii parameter references an array of D3DVALUE's representing the radius of each sphere.
NumSpheres
The NumSpheres parameter defines how many spheres are to be tested.
This parameter must be greater than zero.
ReturnValues
The ReturnValues parameter will reference an array of DWORD's, one element for each sphere tested, if this method returns successfully.
If a sphere is fully visible, its corresponding element will be 0.
If a sphere is partially or completely obscured, the corresponding element will contain a combination of clipping flags that indicate the spheres visibility.
The clip flags returned correspond to those described in TD3DClipStatus::Status.
- See Also
- Top
TDx_3DI_Library v1.90 Component Reference
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[ TDx_3DDevice::ComputeSphereVisibility() ] [ next: Create() ] [ prev: Clear() ] public:
virtual bool __fastcall ComputeSphereVisibility( D3DVECTOR* pCenters, D3DVALUE* pRadii, dword pNumSpheres, dword* pReturnValues );
TDX_3DDEVICE::COMPUTESPHEREVISIBILITY()
[ component method ]
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