Chaos Corona for Cinema 4D > [C4D] I need help!

Scale a texture using an Opacity map

(1/2) > >>

GoTy:
Hi,

I am using C4D and Corona rendering since a long time,
there always something I wanted to figure out about how to scale a texture which uses an opacity mask.

Please find 2 screenshots of my scene, basically I want to apply a moss texture to the bottom of the mountain only.
Instead of selecting some polys, I'd like to use an opacity mask.

However, this works only if the material is applied at 100% scale to the object (Mountain).
But the Moss material is obviously way too big for that mountain.

As soon as I scale down the material scale on the object,
it also scales down the opacity mask so it creates a totally different effect.

Is there a way to keep the opacity mask at 100% and to scale down the Moss texture at the same time to achieve the desired effect ?
I hope my explanation are clear.. :)

This subject might have been discussed before,
in that case could you kindly indicate where ?

Otherwise, can you kindly let me know how to proceed ?
Thanks in advance !
Regards

John_Do:
Hi,

You can scale the moss texture independently from the texture tag in several ways :
- by using a Corona Triplanar shader (though it changes the projection)
- by using a Corona Bitmap shader (so you can scale the texture without changing the projection)
- or by using a C4D Projection Shader (almost the same as the Texture Tag but at the shader level)

You can also modify the gradient scale using '3d - Linear' mode and the appropriate dimensions. Be mindful that the viewport preview is quite limited though.

GoTy:
Hi John,

Thanks a lot for your super quick reply !!

I would like to try your recommendation, however I cannot find any shader like that in the corona shader list..  see attached.

I am on Cinema 4D, not 3DS Max..

I will experiment the gradient scale option first, thanks for that !

Best regards

GoTy:
Found it !

Using 3D liner gradient on object more (not texture)..

The values should match with the object height..

Then it's possible to scale down the moss scale using the UVW,

But the opacity mask keep the same shape using this method.

Thanks again for your help !

John_Do:

--- Quote from: GoTy on 2025-05-13, 09:31:38 ---Hi John,

Thanks a lot for your super quick reply !!

I would like to try your recommendation, however I cannot find any shader like that in the corona shader list..  see attached.

I am on Cinema 4D, not 3DS Max..

I will experiment the gradient scale option first, thanks for that !

Best regards

--- End quote ---

Shaders are added inside a material, so you will not find them here but in the menu next to each texture channel :



Every shader is described in details in the docs.

Navigation

[0] Message Index

[#] Next page