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Rendering Curves With Prman


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how can i render curves with renderman? I can render them as polygons fine but is it possible to render nurbs?

thanks

amir

24588[/snapback]

Hi Amir,

In the "Specific" tab of the renderman ROP, you can set "RiCurve Interpolation" to "cubic" (default is "linear"). You'll need your curves to have at least 4 points. Also these are not NURBs but cubic splines (I don't think ther's ever been support for NURB RiCurves).

Cheers!

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Hallo,

Houdini 8.0.225: Added new support for RenderMan RiCurve primitives. There are now three new detail attributes that can be set to control the output of open polys to RenderMan: "ri_curveinterpolation", "ri_curvebasis" and "ri_curvestep". "ri_curveinterpolation" should be set to either "linear" or "cubic". "ri_curvebasis" can be set to any standard RenderMan basis or a custom basis matrix. When "ri_curvestep" is omitted, the value in "ri_curvebasis" is used to determine the correct step size if possible. The RiCurve Basis parameter (renamed RiCurve Interpolation) in the RenderMan ROP is obsolete and may be removed from future versions. The environment variables HOUDINI_RMAN_CURVE_STEP and HOUDINI_RMAN_CURVE_BASIS are also obsolete and may be removed from future versions.

HTH,

Alex :)

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