Surface Tessellation
Functions Introduced:
The function
ProSurfaceTessellationGet() calculates the tessellation data given by the
ProTessellation object for a specified surface. Use the function
ProTessellationFree() to release the memory used by this data object.
The function
ProTessellationVerticesGet() obtains the vertices for the tessellation for a specified surface.
The function
ProTessellationFacetsGet() obtains the indices indicating the vertices used for each facet of the tessellated item.
The function
ProTessellationNormalsGet() obtains the normal vectors for each of the tessellation vertices.
The function
ProTessellationParamsGet() obtains the UV parameters for each of the tessellation vertices.
The function
ProSurfacetessellationinputAlloc() allocates the
ProSurfaceTessellationInput data object containing the options for surface tessellation. Use the function
ProSurfacetessellationinputFree() to release the memory allocated to this data object.
The function
ProSurfacetessellationinputChordheightSet() assigns the chord height used for surface tessellation.
The function
ProSurfacetessellationinputAnglecontrolSet() assigns the value of the angle control used for surface tessellation.
The function
ProSurfacetessellationinputStepsizeSet() assigns the maximum value for the step size used for surface tessellation.
The function
ProSurfacetessellationinputUvprojectionSet() assigns the parameters used to calculate the UV projection for the texture mapping to the tessellation inputs. The types of UV projection are given by the enumerated type
ProSurfaceTessellationProjection, and are as follows:
• PRO_SRFTESS_DEFAULT_PROJECTION—Provides the UV parameters for the tessellation points that map to a plane whose U and V extents are [0,1] each. This is the default projection.
• PRO_SRFTESS_PLANAR_PROJECTION—Projects the UV parameters using a planar transform, where u=x, v=y, and z is ignored.
• PRO_SRFTESS_CYLINDRICAL_PROJECTION—Projects the UV parameters using a cylindrical transform, where x=r*cos(theta), y=r*sin(theta), u=theta, v=z, and r is ignored.
• PRO_SRFTESS_SPHERICAL_PROJECTION—Projects the UV parameters onto a sphere, where x=r*cos(theta)*sin(phi), y=r*sin(theta)*sin(phi), z=r*cos(phi), u=theta, v=phi, and r is ignored.
• PRO_SRFTESS_NO_PROJECTION—Provides the unmodified UV parameters for the tessellation points. This is similar to using the function
ProSurfaceParamEval().
• PRO_SRFTESS_BOX_PROJECTION—Projects the UV parameters using the box transform. The box transformation uses planar projection to project a point from the face of the box onto the model or surface, which is opposite to the face of the box, where u = x, v = y, and z is ignored.
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