modelling and scene viewers

Hi Dharam!

1) I think it would be useful for you to browse the archives of the email list. There are lots of options to create geometry for use with Radiance. Autocad is one, if you e.g. export dxf and use one of the available converters (see radiance-online.org, strongly recommended!). There are lots of modelers with great support for Radiance, e.g. Blender or Sketchup. And anything that exports obj can be used, too.

2) For viewers, if you want to view Radiance scenes (octrees), the commonly used tool is rvu (rview). The great thing is that it also understands all parameters rpict knows. An alternative tool is Peter's rshow, but you need to install it first. It should also be listed on radiance-online.org. When viewing rendered luminance or illuminance maps (aka images), there is a bunch of tools available supporting Radiance's rgbe format, which is kind of a standard for high dynamic range imaging (HDRI).

3) Ecotect: is another (commercial) software. Maybe it used Radiance, but that does not mean that all Radiance users use Ecotect. As you paid for an Ecotect license, you should expect the provider of that tool to support it, not the community of another, open-source software.

Cheers, Lars.