Material Issue

[Anonymous]

I was recently conducting a daylighting study for a building and came across a perplexing issue- a fully enclosed room (no windows) showed measurable levels of daylighting and with some level of glare. I asked a co-worker, who recommended that I change the material. Voila! The room now shows correctly as having no daylight.

I checked the material and it was fully opaque. Not sure why it was letting daylight through.

Is there some analytic material parameter that I'm missing?

Thanks,

Tyler

[rds3000]

Probably a self-illumination property on some material in the room.  Renderers often do this to fake a lighted room (and to give me no end of consternation!).  It could be just a minor material, and it throws off the lighting calcs completely.

My usual process before running a simulation (all of this is in the Best Practices doc in https://forums.autodesk.com/t5/lighting-solar-analysis-forum/lighting-workflows-tips-amp-tricks/td-p...) is review ALL materials in the model (or filter for 'in use' materials in the Materials Editor) for:

• Appearance property of Self-Illumination, and remove it if it's checked.
• Generic Appearance material with property of Transparency, and if it's not a very minor material change it to Glass or Glazing with the proper RGB for transparency %
• Set all the materials Graphics tab to 'Use Render Appearance' so you can see WYSIWIG in the Revit window about what the materials actually will look like to the renderer.

David

[Anonymous]

Thanks for your reply David!



I'll do that on my next model for sure.



Regards,



Tyler