Pathtracer features in 4.27

I’m not sure if these 2 features are present in some form in pathtracer in 4.27:

Nested dielectrics, volume priorities and volume absorption or absorption for materials like glass in general. Or if there is some other way to achieve good looking glass objects filled with liquids that show some absorbtion…

Additionally it should be possible create automated still sequences from cameras as this was shown in overview video for 4.27, but the tool for auto sequence generation is missing or at least I couldn’t find it so.

Anyone working with pathtracer knows about these features and where to find them in UE?

For glasses water and absorption Nvidia has a branch dealing expressly with caustics.

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Yeah I remember seeing that one. However I’m not sure if that one has some absorption functionality or how it would work with something like glass of wine where you look at the liquid inside another refractive object…

And on top of that nvidias branch is about raytracing and I’m looking to make this work using the pathtracer… Anyways, I’m starting to think these aren’t supported yet.

I just discovered, that there is a new node for UE5 Pathtracer, which allows us to have absorption for glass materials, which also creates colored shadows as a byproduct :slight_smile:

The node:

A quick testrender (the red might be a little bit to strong on the dog statue ^.^ but check those ears in comparsion to the rest of the body, and are there some caustics too?):


I dont think those are necessarily caustics, but if model size is calculated as a volume, then it would look like the end result is similar to caustics.

Looks good though… Ok well… Looks good for Unreal.

As far as static rendering goes, theres obviously more detailed software out there.

As far as being able to render a shot of that from Unreal, yea consider how bad the glass, refraction situation was in .25+ this is most definitely an improvement.

As always the problem is the cost of real time rendering.

If you tried Cryengine’s voxel based ray trace you would have to essentially be insane to develop on anytning else…

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