topic Re: Physical Material and alpha map cutout in 3ds Max Shading, Lighting and Rendering Forum

Physical Material and alpha map cutout

mphillipsESTPB — Tue, 21 Sep 2021 14:43:20 GMT

Hi Everyone,
I am having trouble mapping a leaf to a plane surface. I created an alpha channel map and applied the bitmap as a cutout and have my leaf texture as my base color. However when I render using Arnold my leaf has a slight transparency which I cannot get rid of. Please help !

Re: Physical Material and alpha map cutout

CiroCardoso3v — Tue, 21 Sep 2021 15:33:04 GMT

Can you save one of the leafs with the material and upload it here? Will be easier to explain how it works.

Re: Physical Material and alpha map cutout

mphillipsESTPB — Tue, 21 Sep 2021 15:39:11 GMT

See attached file and Images.. Thank you in advance for your help!!

Re: Physical Material and alpha map cutout

CiroCardoso3v — Thu, 23 Sep 2021 14:44:46 GMT

OK, so I had a quick look. What you need is a diffuse map and a opacity map. Isn't a good idea using a psd file as your texture, as this can't be converted to TX files, and is also introducing some opacity errors.

So, connect a png\jpg\targa file as a diffuse map and the same for the opacity.

Re: Physical Material and alpha map cutout

mphillipsESTPB — Thu, 23 Sep 2021 15:09:18 GMT

I was using a .tga map as my diffuse bitmap. However It still makes the leaf semi transparent. when rendering.

Re: Physical Material and alpha map cutout

Stephen.Blair — Thu, 23 Sep 2021 17:50:22 GMT

@mphillipsESTPB wrote:

I was using a .tga map as my diffuse bitmap. However It still makes the leaf semi transparent. when rendering.

I would use a non-PSD texture for the opacity map too.

What PSD layer did you use? I took the individual layer Layer 1, and the alpha was 1 everywhere.

Re: Physical Material and alpha map cutout

mphillipsESTPB — Thu, 23 Sep 2021 17:55:55 GMT

These is the diffuse map I utilized when rendering the leaf. The other was a tga map (I cannot upload to this chat) which you can generate from the previous .psd file I shared. If you can generate your own .tga file and try to render.

Re: Physical Material and alpha map cutout

Stephen.Blair — Thu, 23 Sep 2021 19:56:43 GMT

I don't have anything for editing psd files

But by using an individual layer from that PSD, I did get opacity (I changed the base color to a flat color, no texture)