[Bf-committers] Duplification of Objects while Ray-Rendering

Meino Christian Cramer bf-committers@blender.org
Fri, 23 Jan 2004 06:22:57 +0100 (CET)


 After RAY-rendering a wineglass, it appears somehow "doubled" on the 
 scene (...I said nothing against a doubled portion of a good wine
 here :)  

 Do as follows:

   * Start with the default scheme
   * Create a curve according to the outline of a wineglass
   * Convert it to mesh
   * Spin along the rotation axis of a wine glass
   * Remove double vertices at the start- and endpoint of the rotation 
     ("...where bertices meet..." :)
   * Go to EDIT mode select all vertices and FLIP NORMALS OUTSIDE

   * Assign material with ray transparency (IOR=1.54), some phong
     shading, specular reflactions and such as you like.

   * Render with RAY set

   * TADA! You will get two glasses ... one inside the other.
	 (hicks! .... or may be a had two much wine...seeing everything
	 doubled ?)

   May be this can be cirumvented by building a "solid" glass from a
   closed curve...BUT:

   1.) If an enduser previously had used a blender with no RAY
       rendering support and has done the wineglass-examples from the
       2.0-Blender-Manual -- s/he will expect to do/see the same only
       more realistic now, since RAY is enabled.

	   This """hurts""" (watch those many "'s!) the 
	   "Principle of least surprise".

   2.) More a feature request than a beetle-report:
	   Would it be possible to make "double sided" work for
	   RAY rendering also?

	   Makeing complex shapes from closed curves --  especially if you
	   have build the shape with an open curve before and tries to
	   close the curve (see 1.) ) -- is a real pain...

 Keep rendering! :O)
 Meino (mcc)