[PD] transparency in models

[niko]

hi H, list
in my experience the proper order of objects is

gemhead
I
pix_image
I
alpha 1
I
colorRGB
I
pix_texture
I
model

you can then play with the last inlet of [colorRGB] to fade in/out 
geos/models. Correct me if im wrong - [alpha 1] should be before 
[pix_texture] in the chain to be rendered correctly.
here are two of my patches using a lot of transparency tricks, hope this 
helps

www.njeremic.ecobytes.net/files/vj-live1.zip
www.njeremic.ecobytes.net/files/baum_pd_patch.zip

greetings
n.


Roman Haefeli wrote:
> On Fri, 2008-04-04 at 22:42 -0400, marius schebella wrote:
>> Hi,
>> I want to apply colors (or textures) with alpha values to obj. models 
>> and then turn them around, but I am having problems if I rotate the 
>> objects. this actually causes problems with standard geos, too...
>> I searched the archives for that problem but I found no real answer. 
>> maybe because there is none?
> 
> iirc, it was discussed before (otherwise i wouldn't be able to write you
> a reply).
> 
> from what i understand, alpha rendering depends on rendering order.
> first, the textures most behind need to be rendered in order to get
> transparency for textures more in front. 
> 
>> what is necessary to get transparency working from all different 
>> viewpoints?
> 
> i don't know if there is a general solution. would be interested as
> well.
> 
>>  I tried to play around with GEMglDepthFunc and other stuff, 
>> but not with the correct result. (correct maybe, but not what I wanted.)
>> any help? thanks,
> 
> i don't know about [GEMglDepthFunc], but a not very realistic approach
> could be to split a model into its planes and change the rendering order
> of the planes dynamically, so that most-behind planes are rendered first
> and most-in-front planes rendered last. calculating the correct
> rendering order needs a lot of math and i don't quit know how to do it.
> 
> 
> roman
>  
> 
> 
> 	
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