Hello Keyshot Community,
I am really desperate and would need your help understanding the issue.
I have moved from rendering single objects for (product design) to interiors with more materials on the renders.
I have the issue of these red sparse dots appearing all the time in my projects, noisy quality
I have attached some examples here.
Any help and tips are welcome
Hi Tom,
What are your render setting in your lighting panel?
I guess it’s from caustics enable (light coming trougth your windows) and too less samples in your render. Did you try denoise?
Caustics push your render up but it needs a lot of computer ressources.
Maybe someone else have another idea.
Hi Tom,
I had the same issue with a few of my renderings, but all you can do (at least that helped me) was to increase the Ray-Bounces up to 30 and also the Global-Illumination up to 30.
Besides that you should use Interior Light Setting as a default.
Other than that it is just a matter of samples and being patient.
Try to render a small region for 5000 samples - hopefully this will smooth the dots.
As @pierre.kairn mentioned, try denoise as well (0.2-0.3 is enough to not loose too many details).
Looking forward to seeing an update.
Like Pierre says, it can be caustics and they don’t add much so I would disable it with a scene like this. Would be different if you were rendering a set of glasses etc. The caustics of a window are not really interesting.
If the window is your only light source the renderer will have a hard time to get light samples in every corner at the scene. A bit same as real life if I look around my room with only one window, lots of dark places in the room and those are really hard for a renderer to render clean.
Like Philipp says, bumping the Global Illumination can help but I would also cheat a bit and put an area light on the ceiling so it helps the renderer lighting the scene. That would make a render such as the last picture easier to render for KeyShot.
That last render has lack of shadows though and that’s because you ‘force’ a lot of light in the room which also tends to make it unrealistic. So you need a bit of balance I think between the area light and the light from outside. To get some more shadows/depth in your image you could add an occlusion node to the textures of the floor/bed/cabinets/etc so you get more feeling of depth.
If you want you may also upload the scene and I can give it a go to see what would work best.
