Thanks for bringing this to our attention. The comparison images definitely help. Let me connect with the Visualize R&D team for an answer.
We tested side by side with Bunkspeed 2014 and Visualize 2017, and got the exact same results.
We would expect more light to spill into the box through the glass, casting a harsher shadow...even when the glass part is 100% visible.
We will follow up with the NVIDIA Iray team to get their thoughts on this matter.
thanks for the feedback. In Bunkspeed 2011 I think, more light would go through...
we were able to reproduce and fix this. This fix will be made available in the next 2017 service pack (2017sp3) and next major version (2018).
This issue is related to the roughness of the transparent material. In order for the most light to shine through, roughness should be 0 which is going to be the default value going forward.
I Think i have the same Problem trying to make a light bulb. I selected the Material "clear glass" and get a perfekt preview, like expacted.
After switching to "fast", the bulb is verry dark and nearly Black. Did I miss something?
After switching to "accurate", the bulb is display transparent, but not as good as the preview...
Tank you for any Answer, Joe
Please try tweaking the following parameters until you receive the expected visual result:
2) Color. Choose a very bright color. In the case of clear glass, the color should be white.
3) Roughness. Set Roughness to 0 for allowing maximum of light passing through glass.
4) Color Density. This is very important for Solid Glass appearances that are non-white. This parameter is dependent on the size of the object itself. For an object which dimension is roughly 1m^3 you should choose a value of 1000 (mm).
Thanks for the tip, Bastian.
If you need help smoothing out your faceted part of the light bulb glass, here is a helpful tip:
This step cannot be undone, so please Save As before starting this workflow. First select blue part tool then select desired part.
No go over to the Palette to the 'Parts/Normal Control' section:
Make sure 'Faceted' is selected, keep the default value of 20, and click 'Rebuild Normals.' If the 'Faceted' doesn't fix your surface how you want, try adjusting the value to either end of the slider and click 'Rebuild Normals' each time to see the resulting effect. If you still aren't happy with the surface quality, then try using the 'Smooth' feature, then select 'Rebuild Normals.' However 'Faceted' works on the widest variety of projects.
Thank you for your fast answers and your Information. i got good results now
Was this problem actually fixed? I've been having troubles with light going through glass material. Material: clear glass
I used light plane above the glass. The inside of the vessel is completly dark unless I disable the glass before light source.
Another problem is that the light from within the vessel casts a shadow outside the vessel on a main plane!!!
In fact every light I add inside the vessel it will cast shadow outside of it.
Am I doing something wrong?