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Guile RMan #5 RtLightHandle

やっと、わかりました。PixarのRenderMan C Bindingにヒントがありました。bulb.cを参考にしました。ありがとうございます。
guile-rmanでのRtLightHandleの記述例：


(define light2 (RiLightSource "distantlight" (list "intensity" 1.2 )))

(RiIlluminate light2 0 )

LightID、"light2"をRiIlluminateでオフ(0)にしています。
以下は、サンプルilluminate.scm
ambientlightのみの灯りになっています。


#!/usr/bin/guile -s

!#



(use-modules (rman rispec))

(use-modules (rman utilities))



(RiBegin "illum.rib")

  (RiDisplay "illum.tif" "file" "rgb")

  (RiFormat 640 480 1)

  (RiProjection "perspective" '("fov" 30))

  (RiTranslate 0 0 5)

;  (RiProgressHandler progress)

  (RiPixelFilter RiBoxFilter 1 1)

  (RiWorldBegin)

      (display (RiLightSource "ambientlight" (list "intensity" 0.2)))

       (newline)

      (define light2 (RiLightSource "distantlight" (list "intensity" 1.2 )))

       (newline)

      (RiIlluminate light2 0 )

      (RiAttributeBegin)

      (RiColor (Color 1.0 0.6 0.0))

      (RiSurface "plastic")

      (RiTransformBegin)

      (RiRotate 90 1 0 0)

      (RiSphere 1 -1 1 360)

      (RiTransformEnd)

      (RiAttributeEnd)

  (RiWorldEnd)

(RiEnd)
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