Chaos Corona Forum

Chaos Corona for Cinema 4D => [C4D] I need help! => Topic started by: steppes on 2023-05-17, 09:07:55

Title: How to load opacity from Alphachannel
Post by: steppes on 2023-05-17, 09:07:55

Hi all,

Cinema 4D native material identifies an images alphachannel, when placed in the textureslot in the Alpha-Section of the material.

How can I achieve this in Corona materials? When loading an image with alpha channel (RGBA) into opacity I get the opacity of the RGB not of the A.

Thanks for help!

steppes

Title: Re: How to load opacity from Alphachannel
Post by: Beanzvision on 2023-05-17, 13:42:47

Is this what you mean? If not, can you share an example?

Title: Re: How to load opacity from Alphachannel
Post by: steppes on 2023-05-18, 12:58:42

Hehe!

No, I know how to use a b/w picture in opacity 😜

What I meant was how to use ONE picture with RGB and Alpha Information (f.e. PNG) in color slot (RGB) and in opacity (alpha).

But I figured it out! It’s about the alpha output in the bitmapshader… never used this before🤪.

Thank you!

Title: Re: How to load opacity from Alphachannel
Post by: Beanzvision on 2023-05-18, 13:51:54

:P Sorry for misunderstanding. Glad you figured it out. There's more on that in this article if it helps :)
https://docs.chaos.com/display/CRC4D/Corona+Bitmap

Title: Re: How to load opacity from Alphachannel
Post by: BigAl3D on 2023-05-24, 22:09:34

Steppes, what I've had to do is once the image is loaded into the Opacity channel in a Corona material, you need to click the thumbnail of the material. This will get you to the window shown in the attachment. Select Layer Set. Then select Alpha Channel. Don't know why it won't see the alpha automatically, but that's how I do it. See image.