openCL, path, different settings.
1) There appear unexpected rectangles rendering with optional light tracing.
2) Reflection of sky on water's surface disappears when rendering with pgic caustic cache is enabled.
1) Where come these rectangles from with light tracing?
2) Why disappears the reflection of the sky with pgic caustic cache?
Unexpected rectangles; Missing sky reflection
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Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Please upload a testscene that allows developers to reproduce the problem, and attach some images.
- FarbigeWelt
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Unexpected rectangles; Missing sky reflection
Light and Word designing Creator - www.farbigewelt.ch - aka quantenkristall || #luxcorerender
MacBook Air with M1
MacBook Air with M1
Re: Unexpected rectangles; Missing sky reflection
It looks like a numerical precision problem, is the bottom of the pool touching the ground ? How is modeled the water ?Try to rise the poll a little and/or to lower the water a little.FarbigeWelt wrote: ↑Tue Nov 19, 2019 12:05 am 1) Where come these rectangles from with light tracing?
Hard to say without a test scene to check what materials are you using etc.FarbigeWelt wrote: ↑Tue Nov 19, 2019 12:05 am 2) Why disappears the reflection of the sky with pgic caustic cache?
- FarbigeWelt
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Re: Unexpected rectangles; Missing sky reflection
I replaced the mesh of the water with a simpler version. Still the rectangles appear with light tracing.Dade wrote: ↑Tue Nov 19, 2019 9:57 amIt looks like a numerical precision problem, is the bottom of the pool touching the ground ? How is modeled the water ?Try to rise the poll a little and/or to lower the water a little.FarbigeWelt wrote: ↑Tue Nov 19, 2019 12:05 am 1) Where come these rectangles from with light tracing?
Here, is a simpler version of the scene. The following pictures have been rendered with this scene.Dade wrote: ↑Tue Nov 19, 2019 9:57 amHard to say without a test scene to check what materials are you using etc.FarbigeWelt wrote: ↑Tue Nov 19, 2019 12:05 am 2) Why disappears the reflection of the sky with pgic caustic cache?
Light and Word designing Creator - www.farbigewelt.ch - aka quantenkristall || #luxcorerender
MacBook Air with M1
MacBook Air with M1
Re: Unexpected rectangles; Missing sky reflection
It is a numerical precision problem, your scene is several kilometers large while you are looking only to few meters. Just set the minimum epsilon value to "0.01" and it will render fine. The other option is to increase the distance between water, pool bottom and ground.
The problem is noticeable with light tracing because the ray are traced from the sky (i.e. the border of the scene) so they start far away from your camera. You were literally looking at the bits of the floating point 32bit precision.
The problem is noticeable with light tracing because the ray are traced from the sky (i.e. the border of the scene) so they start far away from your camera. You were literally looking at the bits of the floating point 32bit precision.
- FarbigeWelt
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Re: Unexpected rectangles; Missing sky reflection
Thank you for the information, Dade. Epsilon of 0.0005 is already enough to remove the precision based rectangles.Dade wrote: ↑Wed Nov 20, 2019 8:54 am It is a numerical precision problem, your scene is several kilometers large while you are looking only to few meters. Just set the minimum epsilon value to "0.01" and it will render fine. The other option is to increase the distance between water, pool bottom and ground.
The problem is noticeable with light tracing because the ray are traced from the sky (i.e. the border of the scene) so they start far away from your camera. You were literally looking at the bits of the floating point 32bit precision.
Still the question remains, why removes PGIC caustic cache the surface reflections.
The minimum radius is rather important to be set correctly, at least what I observed with the fountain scene. To small leads to strange shadows.
Light tracing only, with surface reflections Light tracing and PGIC caustic cache, missing surface reflections, good choice of radius Light tracing and PGIC caustic cache, suboptimal choice of radius Why is there no surface reflection with PGIC caustic cache enabled
Light and Word designing Creator - www.farbigewelt.ch - aka quantenkristall || #luxcorerender
MacBook Air with M1
MacBook Air with M1
Re: Unexpected rectangles; Missing sky reflection
For what I see, the reflection is still there:
The underwater of the pool is just nearly black without PGI because no SDS path can be rendered and the reflection is pretty much the only part rendered (and it is more evident).
The underwater of the pool is just nearly black without PGI because no SDS path can be rendered and the reflection is pretty much the only part rendered (and it is more evident).