png image render problem

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pei_tech
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png image render problem

Post by pei_tech » Fri Nov 16, 2012 4:47 am

I am new to indigo, and I am have a frustrating problem.
I have inserted a png image as a sign in a drawing. When I render it, the "transparent" background shows up in the render.

what it looks like in the model:
Image

what it looks like in Indigo:
Image


It looks as if it is making a transparent area behind the lettering...I have tried setting the image off the face a short distance, but the affect is the same.
Any advice would be greatly appreciated.

tar_gniK
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Re: png image render problem

Post by tar_gniK » Fri Nov 16, 2012 9:32 am

You need to create an alpha /transparency map, with just black and white, so Indigo knows which part not to make visible.

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Whaat
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Re: png image render problem

Post by Whaat » Tue Nov 20, 2012 6:27 am

No, Indigo supports PNG transparency.

Try adding the PNG image as an external texture (change the albedo to 'Texture' and browse for the PNG file)

Are you sure this isn't a GIF? I am surprised it did not work.

pei_tech
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Re: png image render problem

Post by pei_tech » Tue Nov 20, 2012 7:40 am

whaat wrote:Are you sure this isn't a GIF? I am surprised it did not work.
It is png from the sign designer. Been frustrating.

I will try the suggestion you made.

Thank you.

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CADMonkey
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Re: png image render problem

Post by CADMonkey » Wed Nov 21, 2012 9:42 pm

Has the PNG been provided with transparent background?


When I do similar stuff I do the following. I'm pretty new too so I'm sure there are much more efficient techniques:

Create a file in Pshop... with the same RGB background as the green of the canopy.

Paste in the image from the sign-writer.

Save as RGB PNG.
Duplicate the canopy texture in sketchup and apply that PNG to it.

I find this useful. The niggle is that if you tweak the canopy material you have to do it for the logo material too.

tar_gniK
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Re: png image render problem

Post by tar_gniK » Thu Nov 22, 2012 12:01 am

That would work too, but regardless of whether Indigo supports png transparency, it is just easier just to make a black and white image, and apply it the clip map channel of the texture. The first image of the model shows the image has got an alpha, but using a clip map eliminates doubt.

Does not take longer than a few seconds to do. Example:
Attachments
clipmapinverted.png

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CADMonkey
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Re: png image render problem

Post by CADMonkey » Thu Nov 22, 2012 12:29 am

Tar,

Ahh yeah that looks locigal...

I knew there would be better ways. This would save me from having two materials to maintain.

So how do you apply the green canopy material and the logo to the face?

I guess it would be a blend (advanced stuff not played with much yet)?

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Zom-B
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Re: png image render problem

Post by Zom-B » Thu Nov 22, 2012 12:36 am

The problem here is that the texture has alpha and therefor the green box gets transparent, so you can se inside guys :lol:
For such stuff you need to blend the green material with the logo using a clipmap, and no alpha PNG.
or you create a mesh plane that you put some mm away from the green roof thingy and apply the logo texture on it...
polygonmanufaktur.de

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Whaat
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Re: png image render problem

Post by Whaat » Fri Nov 23, 2012 6:14 am

Zom-B wrote:The problem here is that the texture has alpha and therefor the green box gets transparent, so you can se inside guys :lol:
For such stuff you need to blend the green material with the logo using a clipmap, and no alpha PNG.
or you create a mesh plane that you put some mm away from the green roof thingy and apply the logo texture on it...
:lol: I should have caught that! Nice one Zom-B.

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