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Default transpancy with camera per pixel mapping in Max .. - 05-24-2007, 08:12 PM

Hey guys,

Max > composite map > per pixel ...

There's two approaches with camera mapping, using a cam map modifer, selecting the object, creating a tif with transpancy and applying that.

That's cool, when i load in the tiff i copy this over to the opacity and that gives me the transparany, is that right? it seems to work.

Then the second way of doing camera mapping is with the camera per pixel map, the only trouble with this is that you can't copy the tiff into the opacity to get the transparancy. So that's my problem, using a per pixel approach how do you get the transpancy?

Cheers - Dave.


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Default 05-24-2007, 10:19 PM

I split out the opacity to a grey scale image (in photoshop) and simply put another camera map per pixel into the opacity slot of you material. I do it all the time.

Glenn
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Default 05-25-2007, 12:41 AM

Hey thanks,

However that trick don't seem to work. Note that i have a composite map in the diffuse slot with two cam per pixels maps, one the base and the second a patch.

Just to clarify what you said i copied the composite map from the diffuse slot over to the opacity, i then replaced the two maps with greyscale versions. (desaturated/flat tiffs saved out from PS)

mmm, struggling with this one, hope you can still help :)

- Dave.


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Default 05-25-2007, 04:53 AM

just make a image with the alpha channel together and check on the opacity slot the alpha not none


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Default 05-25-2007, 05:34 AM

http://www.members.optusnet.com.au/~...ramapsolve.zip

here is a solution... Remember to turn off tile for each of the texture maps like I did. It's quite a trap.

Cheers.
Glenn
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Default 05-25-2007, 12:19 PM

Cheers Glenn,

Looking over the file I understand what you mean and it's pretty similar to the setup i tried. But still no luck, it's had me puzzled for a good three weeks this, i'm going a little nuts :)

Pleae take a glance over the file:

http://www.capturefx.co.uk/web/canyon1.zip (1.4mb)

I've reduced the file size of the maps and removed half the scene texture but i think if you open up the file and hit render you'll quickly see the problem area, a pink line around the canyon edge.

Cheers again - Dave.


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Default 05-25-2007, 05:25 PM

Here is what I did..

Firstly, your mattes were negative. I inverted them.
Secondly I copied the composite map into the opacity channel and swapped out the textures for the opacity maps.

The biggest omission with your work was a mask to blend between the two images in the second composite map slot of the opacity channel. Check out the file so see what I mean. Hopefully this addresses your problems. It's a tricky thing to set up (perhaps needlessly so but hey, it works.)


http://www.members.optusnet.com.au/~...el/canyon1.zip


Glenn
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Default 05-25-2007, 06:05 PM

Hey Glenn,

Well you just made me a very happy guy today :) that's really been bugging the hell out of me for quite a while now. I never would have figured the masking part, it's a tricky one to get your head around but i kinda get it, though i did always wonder what the mask was for in the per pixel map.

I love Max for a lot of reasons but Jeeze it's a pain in the butt when it comes to camera mapping compared to other programs. Anyway i think that's pretty much the last hurdle so now i feel like i can start been creative :)

Cheers again, i'll post this up when it's finished and maybe you can give me a little critique.

By the way love your website, the Adelaide character looks very sweet in a menacing kind of way :) Nice to see such a veriety of skills and interests, the Childrens books look cool, i once tried Childrens illustration, i even took a year course in the subject but for all the creative talent i had i could never come up with an original story :)

Thanks - Dave.


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Default 05-25-2007, 07:27 PM

Cool. Sounds like an in depth tut is required. A lot of people stumble with CamMaPerPixel. I know each time I use it I almost have to re-learn it. Your file was a brain twister all over again.


Glenn
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Default 05-25-2007, 07:30 PM

http://www.cgarchitect.com/resources.../tutorial2.asp

http://www.3dluvr.com/content/article/66/1

Here's two tuts but I haven't had the time to read them properly.

Glenn
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