Special material transparent to view but opaque to sun??

[Anonymous]

It would be brilliant to have a special material that is totally transparent to view but will still cast shadows like a solid material.
With this, the obscuring structure between viewer and area of attention could be changed to the magic material so that internal observations of sun access could be made.
An example would be to generate a vertical, parallel projection, Sun Study, of a selected unit, showing the totality of the unit in a single Sun Study, in a multiple housing project.
Is it possible to have such a material?
Is it possible, say in Lightworks, to do this already?

David
ArchiCAD 11

[Dwight]

The windowlight is a complex and dangerous light source.
Use a light cone instead.

[Paul King]

Palawat wrote:
How about this?

In LW, set your material's Colour Class to Plain > pure black and set the Transparency Class to Plain > pure black also.

I can't seem to make this work in Cinerender. Has anyone come up with a way to do this under ArchiCAD21?

[Anonymous]

Is it possible to use this solution in Cinerender to make renders, so you have the facade like invisible, allowing a better view of the interior, and with shadows in the interior?

[Anonymous]

it solved here for cinerender


https://archicad-talk.graphisoft.com/viewtopic.php?f=3&t=69508