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kkamin

Issues with Mixing Textures

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Hi,

 

I'm trying to add some grunge to one of my objects, so I created a new material and loaded the grunge into my color channel and created a high contrast, black and white version to load into my alpha. I'm looking to overlay it on top at a faint opacity. When I try to make the alpha channel darker to reduce the opacity it doesn't do anything until it is full black, then it just turns the material off. There is no in between. I've toggled the 'mix texture' button but that doesn't help. Any guidance would be appreciated.

 

 

Grunge_Issue.jpg

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No, we should be able to use the alpha channel as you are trying to do. Or we could add the grime within a single material instead...

 

CBR

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Thank you! What you said makes sense and once I get in tomorrow I'm sure it will be a great solution.

 

What I'm not quite getting and what you explained, is that the alphas in C4D sort of act differently than in image editing programs and in After Effects. As you know, in those programs, the grayscale alpha controls the opacity of the image and allows composites with vary degrees of transparency to stack. There really isn't a way to tell a stacked material to be less opaque? I realize you mentioned the projector shader, but what if I need the reflectance or the diffusion to be different with this grunge layer?

 

Thanks again for taking the time. You're preventing me from punching my computer. : D

 

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47 minutes ago, kkamin said:

What I'm not quite getting and what you explained, is that the alphas in C4D sort of act differently than in image editing programs and in After Effects. As you know, in those programs, the grayscale alpha controls the opacity of the image and allows composites with vary degrees of transparency to stack. There really isn't a way to tell a stacked material to be less opaque? I realize you mentioned the projector shader, but what if I need the reflectance or the diffusion to be different with this grunge layer?

No, I obviously haven't explained that well enough - I'll go back and remove the confusing bits :) Alphas in Cinema can do greyscale values just as they do elsewhere, and you can  use that to fade in one material over the top of another. And sometimes it makes sense to do that, like if, as you say, your second material has radically different surface attributes across multiple material channels. Although you could use masks in all those channels, it's probably less work to just use a second material.

 

Oh, and I have just spotted why that isn't working for you ! You need to untick 'Use Image Alpha' - as soon as you combine that texture with the colour, you are no longer using the alpha info embedded in the original texture, but rather the combination of that and the colour you are adjusting over it, so that needs to be unticked - does that make sense ? Let me know if that doesn't sort it out for you, but I am 99% sure it will...

 

CBR

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Ahhh, got it! Perfect. Thanks, and thanks for all the other tips.

  • Namaste 1

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