Issue with Color Variations in Corona MultiMap

[tencer]

Hello, I am experiencing an issue while using Corona MultiMap in several scenes. I'm working with sRGB images that have slight color variations. However, when rendered, these variations appear excessively pronounced, which impacts the final result. This issue occurs across multiple scenes and with other maps as well.

We are using 3ds Max 2025 with Corona 12 Update 1, and the Color Management Mode in 3ds Max is set to Gamma Workflow with a display gamma of 2.2.

Could you help me identify the cause and provide a solution for this problem?

Thank you in advance for your assistance.

[romullus]

Hi,

I'm not sure what result you are expecting, it appears from the screenshots that these colour variations are already in the textures and the multi-map has nothing to do with that. If you want less pronounced variations, you need to reduce them in the textures, either destructively in photoshop, or non-destructively in 3ds Max material editor with colour correction nodes. Alternatively you can ditch all the textures, except one or two and perform HSV randomization directly in Corona multi-map. Personally i prefer the latter method most of the time.

[maru]

I also think Corona is doing what you are telling it to do. Perhaps you could try setting up a simple scene with cubes or other geometry and using a different render engine, then check if the colors are the same as in Corona or not.

Another idea would be using the "mix amount" parameter in the Corona Multimap - that would blend all the textures together making them more similar.

[jrgby]

It's difficult to tell sometimes from the material editor as there is some UI boarder and gap between swatches, but often it's just a couple of the bitmaps most at fault and throwing in a color correct in between to knock it down does the trick.

Easy way to trouble shoot is to change the Multi tex frequency to 0 for suspected bitmaps whilst Interactive rendering.