this is an old issue .
I need to study sunlight and shadows for a complete plan which comes through windoes ..etc.. so, I select top view and render with hide ceiling , subsequentely the sun light enter the room from the space of hidden ceiling ( in the attachment I need light in blue boundary but without that ones in yellow )
what I ask for is, can I found a way to give the ceiling material which I can see through but cast shadows ,
I hope I can found the answer with cinerender but if any way with render or without are welcome
and I don't know If I can get that from Rhino and grasshopper
thanks in advance
about ten years ago I asked the same question and I get this great answer (and have kept it for long time and I had used it with LW render before it was removed by cinerender )
If I understand you correctly, the question you are asking is "How can I
do a sun study of the floor plan, but with the roof still in position so
you can see the shadows cast from it?"
To paraphrase - Set up a new lightworks material with the material's
Colour Class set to Plain > pure black and set the Transparency Class to
Plain > pure black also. Temporarily apply this material to the roof and
any other structures you need to see through but still want to cast
Apparently there are some issues with multiple light sources, but give
it a go anyway!
What's really needed is a true 'shadowcaster' material/shader. One
that's completely transparent, yet still casts a solid shadow.
First of all did you georeference correctly your model into "Option/Environment Project/Project location" ?
"...I don't know If I can get that from Rhino and grasshopper...
It is possible with these tools but it is also often possible to do without.
You can do two views with each shadows you want
You are able to disable transparency (about your windows) into on of your doc 3D view to delete your "blue" shadows inside you construction. Finaly put these views on a same layout.
Christophe - FRANCE
Archicad Designer and Teacher
Archicad 15 to 24 FRA FULL
OS 11 Big Sur
"Quality is never an accident; it's always the result of an intelligent effort " - John Ruskin
That video deals with similar setup for a wall you can see through. If you turn on subtitles and translate from Russian, you should get the general idea.
thank you, that exactly what I was searching for ,
I just faced one problem with language not in the youtube but in the AC menus so I try to count the order in menu and that does not work because the orders sort alphapictally. I get the idea and it works prefectly thank you again