Transparency problem

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Old 03 March 2013   #1
Transparency problem

Hi Guys,
I have a copy of Maya 2008 and am trying to map a bottle label onto a plane which I have curved around my bottle. Thing is, I want just the label to show up (as I have also added an alpha channel to try to make it just the label shape that is showing however it's still showing the whole plane area (even the part that I wanted to not be visible (i.e. non label area)) The part I don't want to be visible is slightly translucent but I can't work out why?

So in essence, all i want to see of the label is just how it would be on a real bottle (oval'ish shape) and not the whole curved plane shape.

I am quite new to this stuff so please be gentle with me! LOL!

Here's what I'm currently getting:

 
Old 03 March 2013   #2
It may be an issue with the alpha, but it may be easier to map a texture int the transparency channel of whatever material you're using. Basically the transparency map is black where you want something to be opaque, and white where you want full transparency, and anything between the two is obviously semitransparent. Also, if you're using reflection or specularity or something, make sure those are turned all the way down for the region you're trying to make transparent. Again you may have to use maps. When materials/renderers are attempting to mimic physical accuracy these properties can all have important effects on the lighting and shadows.
 
Old 03 March 2013   #3
Hey VB2341, thank you for your reply, much appreciated.

I do know that the shader I've used for the label has a pure black and white alpha but still the "transparent" part looks kind of like cellophane and isn't completely transparent.

I will try turning down the reflectivity to see if that helps...
 
Old 03 March 2013   #4
Actually I did look for the reflectivity but the shader is a lambert and it doesn't seem to have the option to do anything about reflectivity....or am I missing something?

Would be really grateful for a solution to this as I'm really stuck.
 
Old 03 March 2013   #5
It looks like shadows are being cast from the invisible plane, but anyway to avoid any of these problems I wouldn't render the bottle and label at the same time. Render the bottle, render the label, render a matte for the label then put them together in post. Breaking your scene up will always give you more control.
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Old 03 March 2013   #6
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