[vtkusers] upgraded vtkGLUTesselator

[Malcolm Drummond]

Hi

Sorry to use attachments like this ... I don't have a web-site yet.

I've updated the code for the vtkGLUTesselatorTriangleFilter as recommended for GLU 1.2/1.3. I've also added methods to set Tolerance and WindingMethod (the latter has convenience methods to enable use when scripting). I've attached the code with scripts for the self-intersecting star example from the OpenGL Programming Guide.  

If it meets your standards (and backward compatability to GLU 1.0/1.1 is not a big issue) please check it in.

I plan to add a method allowing use of the BoundaryOnly property soon.

A question - What is the preferred approach when using Set/Get Macros on non-standard types defined outside of VTK? I have the following ...

// Description:
// Set WindingRule property. Can be any of GLU_TESS_WINDING_ODD, GLU_TESS_WINDING_NONZERO,
// GLU_TESS_WINDING_POSITIVE, GLU_TESS_WINDING_NEGATIVE or GLU_TESS_WINDING_ABS_GEQ_TWO.
// Default is GLU_TESS_WINDING_ODD.
vtkSetMacro(WindingRule,GLenum);
vtkGetMacro(WindingRule,GLenum);

// Description:
// Convenience methods to set the WindingRule property
void SetWindingRuleToOdd() {this->SetWindingRule(GLU_TESS_WINDING_ODD);}
void SetWindingRuleToNonZero() {this->SetWindingRule(GLU_TESS_WINDING_NONZERO);}
void SetWindingRuleToPositive() {this->SetWindingRule(GLU_TESS_WINDING_POSITIVE);}
void SetWindingRuleToNegative() {this->SetWindingRule(GLU_TESS_WINDING_NEGATIVE);}
void SetWindingRuleToAbsGEqTwo() {this->SetWindingRule(GLU_TESS_WINDING_ABS_GEQ_TWO);}

... now, while I can set WindingRule using the convenience methods under python/tcl, I can't get the current value as the wrapping parser skipped the Set and Get Macros (because of GLenum). Should I replace GLenum here with something the wrapper likes, or should I provide something like GetWindingRuleAsString and return eg. 'GLU_TESS_WINDING_ODD'.

Thanks
Malcolm Drummond
GeoVision cc
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