Alpha problem

[okno]

I need moore first result - i have space ship floor - so i have panels with holes, but when i model it my scene start to need big disk space and it slowes my computer. If i im i cinema i use alpha to get similar result (like with plane on image)



This is what i need (panels with holes are modeled)

http://home.tiscali.cz/web_okno/Chodba.jpg

[StefanA]

see if this image helps you.

http://home.tiscali.se/sbanders/alpha_node.jpg

[okno]

So kube is orange and how look alpha_test_tga?
is it image with image+alpha? or just image?

In cinema4d i use this method.
I use jpg image - yellow triangle - as colour and then i use the same triangle but black as alpha an i will get only yellowtriangle
http://home.tiscali.cz/web_okno/Alfa1.jpg

And other thing, in cinema im able to see this: (cube have no colour - only alpha and cubic mapping)

http://home.tiscali.cz/web_okno/Alfa2.jpg

but in XSI i see it only in render region :-(

[tachy0n]

Originally posted by okno
...In cinema4d i use this method.
I use jpg image - yellow triangle - as colour and then i use the same triangle but black as alpha an i will get only yellowtriangle[b]

You can use the same method in XSI also. Either use the 'alpha' image to control the weight in a mix2color, or have the alpha as a channel in your color image and check the "Multiply weight by alpha" option

[b]
And other thing, in cinema im able to see this: (cube have no colour - only alpha and cubic mapping)

Apply the alpha image to the transparency attribute of your shader

but in XSI i see it only in render region :-(

Dunno why this is happening... have you tried increasing the ray depths ?

[okno]

where can i increase ray depth? in manual i fount only icreasing in render options but i need this efect directly in viewpoint

[tachy0n]

http://www.angelfire.com/art2/tachy0n/tmp/RealTime.gif

Yes, ray depth only affects the render, not the viewport. To see the tranparency in the viewport, create a real time shader node:

nodes-->real time-->alpha transparency

and connect your image with alpha channel to the texture input in the OGL2DT node(use the orange clip node, not the green image node) Then use the realtime viewport mode to see the transparency. You can use the same image through a pick_channel node to drive the transparency also so it will show up in the render.

[okno]

Thanks for that.

[CGTalk Moderation]

This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum.