Author Topic: Using a substance inside a MDL network (Read 4835 times)

andrew.cirillo · **on:** October 27, 2016, 01:33:10 am

Hi,
I'm having some problems with exported mdl's that use a substance that contains the tile_generator_color with 'input_image' set as the pattern type.
The output in the substance render view looks fine, but when i export the mdl preset and use it in other applications the diffuse colour is all wrong. It almost looks like a gamma problem, but I'm not so sure.

andrew.cirillo · **Reply #1 on:** October 27, 2016, 02:05:21 am

Here is a direct comparison from the iray/substance output and the output i get from another application using iray and the exported mdl

andrew.cirillo · **Reply #2 on:** October 27, 2016, 02:26:27 am

Here is the same mdl material with the tile_generator_color node removed from the substance in both the substance 3d view and in external iray

andrew.cirillo · **Reply #4 on:** October 27, 2016, 08:24:46 am

Hi Vincent,
No Problem. I have attached a cut down version of the sbs and texture that displays the problem.

I've since discovered that a new release of iview with a newer version of iray does not display the problem. This is great, but I need to be able to use the mdl exported from SD in older versions as well, so i need to find out why this is happening.

andrew.cirillo · **Reply #6 on:** October 27, 2016, 01:00:21 pm

The only dependency missing should be the source texture. You should be able to just put the previously supplied jpg texture as the input image.

andrew.cirillo · **Reply #10 on:** October 28, 2016, 12:11:11 am

It is definitely not the tonemapper in iview/iray. I have tried all tonemapper options and I get the same resulkt with the SD exported mdl, and this only happens when I have the tile_generator_color node in the substance network.

andrew.cirillo · **Reply #11 on:** October 28, 2016, 12:23:51 am

Quote from: Vincent Gault on October 27, 2016, 01:56:14 pm

the mdl as I see it seems weird: I recommend you start from a preset (metal roughness for example)
what is the final software it's supposed to be used ?

Hi Vincent,
The base mdl may be a bit weird as I built it from scratch, however I note that if I switch it for a preset like the metal roughness, the problem becomes even worse. See the attached image (this was rendered in iview).

The intended software is a set of proprietary Reality Server applications that use iray as the renderer.

andrew.cirillo · **Reply #13 on:** November 01, 2016, 12:41:06 am

Quote from: Vincent Gault on October 31, 2016, 11:21:03 am

can yo usee the one you did based on the preset?

I assume you want to see the sbs? This one uses the previously supplied jpg as input. I have inserted the physically based (BaseColor/Metallic/Roughness) preset.