Strange glass reflections from hdri (3dsmax)

[pproestos]

I render a building and I put as environment map an hdri image. I create a skydome light and assign a physical sky into it. As you see in the render image, the glass reflections are way pixelated, instead of showing the sky clouds. Why is this happening? thanks for any answers...cloud.jpg

[Stephen.Blair]

Have you tried increasing the resolution of the skydome? (for example, if the HDRI is 8k, the default resolution is 1k and should be adjusted)

[pproestos]

Thanks for your answer Stephen. Unfortunately it doesn't change... I send you the project file. Just put an hdri as environment map and render region close to a glass exterior if you want.

I am using 3ds max from 1990 (3d Studio).

Arnold is the best renderer ever I have used. I am totally satisfied... 🙂

.taksiarxwn.zip

[Stephen.Blair]

I don't know what an "environment map" means, because I don't use 3ds Max. I'll have to export an ASS file to see what it means in Arnold.

I assumed the HDRI was plugged into the skydome, which would give you more control over the resolution.

So the HDRI is plugged somewhere else, probably some sort of background shader, so it's probably texture blurring.

[lee_griggs]

It could also be something to do with the normals of the glass. Try assigning the same glass shader to another object and see if it still happens.

[pproestos]

Stephen and Lee thank you for your answers.

You inspired me to find the solution...

I didn't change anything. Ok it is better

to assign directly to skydome light an hdri but

then I loose my Physical sky sunlight wich I love a lot! 🙂

So what I did?

In Arnold render setup->Arnold renderer->Environment, background & Atmosphere->Advanced mode and then I clear specular reflections from "Enable environment lighting from skydome light" and I enable specular reflactions in Background (Backplate)

and voila! 🙂

Cheers guys! 🙂tttt.jpg

[J_Saarinen]

Increasing the skylight resolution under the "shape" section fixes this instantly. No tricks needed.

[pproestos]

@Jari Saarinen

Nope... not true.

The solution I described is the only way working at list for me.

Shape resolution 1000

Shape resolution 10000

See how badly the clouds are mirrored.

And now as I mentioned before:

go to render setup->Arnold renderer->Environment, background & Atmosphere->Advanced mode and clear specular reflections from "Enable environment lighting from skydome light" and enable specular reflactions in Background (Backplate)

Result:

[J_Saarinen]

Ok, for me the resolution increase works, but I don't use environment map slot, I mostly use HDRI maps through Skylight.

[pproestos]

ok sure...

... so for the sun you use the hdri's sun, you don't use the physical sky material?

You have better results?

[J_Saarinen]

I would not say better results, but the same results. Physical sky is equally good option to use but I like to tweak my lights quite a bit so skylight/direct lights work better for me in many cases.

[MikeWile]

I get a much better result by doubling the resolution in the skydomeLight attributes, and only a few seconds longer to render. thanks!