Transparent Label
- Thread starter JoeMonte
- Start date
Swizl
0
Hi Joe,
While I think this probably could be done directly in C3d, you would have to use a lot of masks and nodes to do this. It would probably be easier to set the opacity (Alpha Channel) in an image editor, like Photoshop, Affinity Photo, etc. Just make sure that the alpha channel check box is ticked in your C3d material so it can utilize that channel.
If you just have to do it all inside the C3d material, I can find a few posts here that may face you in the right direction. Be aware that some of the nodes, like the composite node will not show up in the OpenGL viewport. So it makes it a little trickier to edit and see what is actually happening when you are working with materials like that.
Edit:
It's also possible to split this into two separate materials, but you'd still either need to mask off the curved part of the label, or create actual polygonal geometry that would then need to be UV mapped to fit the bounds.
While I think this probably could be done directly in C3d, you would have to use a lot of masks and nodes to do this. It would probably be easier to set the opacity (Alpha Channel) in an image editor, like Photoshop, Affinity Photo, etc. Just make sure that the alpha channel check box is ticked in your C3d material so it can utilize that channel.
If you just have to do it all inside the C3d material, I can find a few posts here that may face you in the right direction. Be aware that some of the nodes, like the composite node will not show up in the OpenGL viewport. So it makes it a little trickier to edit and see what is actually happening when you are working with materials like that.
Edit:
It's also possible to split this into two separate materials, but you'd still either need to mask off the curved part of the label, or create actual polygonal geometry that would then need to be UV mapped to fit the bounds.
Swizl
0
There are a few throughout the years. If you search for label, some will pop up.
These will help you get started:
https://www.cheetah3d.com/forum/index.php?threads/11738/
https://www.cheetah3d.com/forum/index.php?threads/10921/
https://www.cheetah3d.com/forum/index.php?threads/10837/
https://www.cheetah3d.com/forum/index.php?threads/9795/
https://www.cheetah3d.com/forum/index.php?threads/9644/
https://www.cheetah3d.com/forum/index.php?threads/4115/
You could also search for "bottle" and a few other search terms.
These will help you get started:
https://www.cheetah3d.com/forum/index.php?threads/11738/
https://www.cheetah3d.com/forum/index.php?threads/10921/
https://www.cheetah3d.com/forum/index.php?threads/10837/
https://www.cheetah3d.com/forum/index.php?threads/9795/
https://www.cheetah3d.com/forum/index.php?threads/9644/
https://www.cheetah3d.com/forum/index.php?threads/4115/
You could also search for "bottle" and a few other search terms.
In essence this is pretty easy:
You need a material-shader for glass: 100% transparent, Index of refraction: 1.55, enabled Fresnel - bit of reflection
Drag that onto the whole glass mesh. Select the polygons where the label should appear - UV unwrap that portion.
make a copy of of your glass material, enable alpha channel for your PNG/tiff decal (a blank border around your decal would help), reduce reflection, drag your label onto the selection. You can check placement while the image is in edit-mode at the image loader.
Cheers
Frank
You need a material-shader for glass: 100% transparent, Index of refraction: 1.55, enabled Fresnel - bit of reflection
Drag that onto the whole glass mesh. Select the polygons where the label should appear - UV unwrap that portion.
make a copy of of your glass material, enable alpha channel for your PNG/tiff decal (a blank border around your decal would help), reduce reflection, drag your label onto the selection. You can check placement while the image is in edit-mode at the image loader.
Cheers
Frank
Swizl
0
Nice vacuum tube model. What do you not like about the label?
There´s an rendering issue when an alpha image is applied:
I wasn´t able to solve it.
Cheers
Frank
I wasn´t able to solve it.
Cheers
Frank
Hi Frank-
Would you be able to do a step by step on this one too? I just can't seem to get this down correctly.
As proofed above it doesn´t work as expected. In my example in reply N°6 it´s just not obvious/visible. Strange though as I´m pretty sure I´ve managed it earlier. 
Cheers
Frank
Cheers
Frank
ZooHead
0
Sorry to hijack your thread. For you're situation this method may still work, as the actual label is transparent.
So I would expect to see the edge, but it depends on the lighting. My example is modeling a silk screened logo.
This is what's about in this thread.
In other cases there are mix- and composite-node to combine different material features/attributes.
Cheers
Frank
ZooHead
0
It looked like an acetate label in the example.
The other methods are more complex to set up, the alpha method is more elegant.
This link on the list has lots of good info.
https://www.cheetah3d.com/forum/index.php?threads/9795/
If you're going to UV-unwrap the whole tube which isn't even necessary when it's made from spline+lathe-creator you can avoid the latest mapping issues completely.
Cheers
Frank
Cheers
Frank