Using multiple projections per surface. Tweet

[gristle]

Hi.
I'm trying to setup a brushed surface, with a logo applied.
Main surface is glossy, with an image map and box projection creating the brush bump.
Other surface is glossy as well, and mixed using an image and UV map.

When I plug the main surface in directly to the material node, it appears as I want. When I route it through the mix material, it fades dramatically. The odd thing is if I apply the brush as diffuse instead of bump, everything works as you would expect.

Any ideas?

[gordonrobb]

Pictures might help.

Are you using an alpha to mix the materials? Is it fully black and white?

[gristle]

I'll set up a dummy scene tomorrow to illustrate the issue.

Yes, black/white image to control the blend.

[gordonrobb]

What I mean though is are the extremes fully black and white? 0 and 255

[gristle]

Correct. With AA edges.

[gordonrobb]

Let's see some pics then.

[gristle]

Ok, here are some pics. Firstly, another issue I've stumbled upon.

Image is controlling the mix. Notice how the logo is inverted.

Now I have plugged the 2nd material directly into the surface node and have plugged the mix image into the diffuse. Now the image is the correct way around. This strikes me as pretty odd.

Now the issue I mentioned yesterday.

Brushed surface and logo are mixed via image.

Now the brushed surface is plugged directly into the surface node. Notice the brush scale and/or strength has changed.

I don't know if I am missing something obvious but this does not seem right to me.
Scene file attached.
Cheers!

[juanjgon]

I am testing this issue in Standalone and it also happens there, so I think that this is a Octane problem. I am going to post this bug to the developers team to see what could be the problem.

-Juanjo

[gordonrobb]

Hmm, had a look and I'm not sure I understand what is going on either. I'm fairly sure it's because you have different projection nodes. If you use the OctaneUVMap node into the normal input instead of the new projection nodes. Then alter the texture U and V settings to what you want, this problem isn't there. So it's definitely something to do with those projection nodes. Quick fix, either UV it, or use the UVMap tool.

Over to Juan

[gristle]

I normally use the UVMAP node using the LW T function (single click, autosize, cannot go wrong!)
but the downfall with this is if you use images with differing scales. That is why I tried the new projection tools. I could use a UV map; sometimes that is not suitable though.

Juanjo, is the image flipping an Octane issue as well?
Thanks for looking into this.

Andrew.