topic Re: opaque is deprecated warning in Arnold for Cinema 4D Forum

opaque is deprecated warning

michaelmatthews1 — Mon, 01 Nov 2021 14:57:13 GMT

Hello,

Every time I open the Arnold IPR window I start getting warning messages saying "opaque is deprecated". What does this mean and how can I address it? Thanks!

Michael

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Arnold IPR started at Sun Oct 31 11:54:27 2021

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[c4dtoa] 00:00:10 3502MB WARNING | opaque is deprecated: opaque is off for geometry "/Null/Surface/Loft|Loft", but there is no opacity metadata for some of its shaders

[c4dtoa] 00:00:10 3502MB WARNING | opaque is deprecated: opaque is off for geometry "/Null/Surface/Loft_7|Loft", but there is no opacity metadata for some of its shaders

Re: opaque is deprecated warning

Stephen.Blair — Mon, 01 Nov 2021 19:12:09 GMT

Select the Opaque check box for those Loft objects.

That Opaque check box is no longer used. Instead, "smart opaque" can figure out whether or not an object is opaque by looking at the surface shaders on the object.

But if you put some other type of shader, like say a Color Correct, on an object, and turn off Opaque, you get that warning.

Re: opaque is deprecated warning

maxtarpini — Tue, 02 Nov 2021 16:25:11 GMT

Do you know if this has been updated also for custom shaders that does transparency ? Maybe there's an inner flag or something available now ? Last time (6.2 I think) I checked it was not and I had to un-check opaque to have transparency.

Re: opaque is deprecated warning

Stephen.Blair — Tue, 02 Nov 2021 16:49:11 GMT

A custom shader would have to provide the opacity metadata, as shown here:

https://docs.arnoldrenderer.com/display/A5ARP/5.3.0.0

Is that what you're doing?

Re: opaque is deprecated warning

maxtarpini — Tue, 02 Nov 2021 17:01:30 GMT

Exactly what I was looking for, thanks !

Re: opaque is deprecated warning

agustin.gonzalezA9F92 — Tue, 18 Apr 2023 07:58:46 GMT

hi there guys,

can you guys point me to the doc example that shows how to provide the opacity metadata?

the documentation changes and the link from Stephen don't work anymore.

thanks!

Re: opaque is deprecated warning

peter_horvath — Tue, 18 Apr 2023 16:52:59 GMT

You can find it in the Arnold 5.3.0.0 release notes.

The relevant bit:

// - \`opacity_term\` tags a parameter that is opaque when equal to 1 or (1,1,1) // - \`transparency_term\` tags a parameter that is opaque when equal to 0 or (0,0,0) // The additional integer brackets together terms with the same number. // This metadata setup from standard_surface: AiMetaDataSetInt(node, "opacity", "opacity_term", 0); AiMetaDataSetInt(node, "transmission", "transparency_term", 1); AiMetaDataSetInt(node, "transmission_color", "transparency_term", 1); AiMetaDataSetInt(node, "metalness", "opacity_term", 1); // is equivalent to setting: // opaque = (opacity == AI_WHITE) && (transmission == 0 || transmission_color == AI_BLACK || metalness == 1);

Re: opaque is deprecated warning

ssjenforcer191191191 — Fri, 03 Nov 2023 05:09:29 GMT

I am getting this warning for 5 of my instances every time I use IPR regardless if Opaque is checked for the scatter object or not.

Does this warning even mean anything?

Re: opaque is deprecated warning

peter_horvath — Mon, 06 Nov 2023 17:40:01 GMT

@ssjenforcer191191191 wrote:
I am getting this warning for 5 of my instances every time I use IPR regardless if Opaque is checked for the scatter object or not.
Does this warning even mean anything?

The instancer always overrides the opaque flag of the instances hence the warning. (You see 5 messages, because that's the limit of warning messages set in the render settings by default.) The warning itself is harmless, you can ignore it. This parameter was deprecated when the smart-opaque feature was introduced. There are some corner cases where the opaque flag can still be useful, but normally it's not used anymore.