[Verse-dev] using material node for audio

[Peter Lundén]

Eskil Steenberg wrote:

>Hi
>
>  
>
>>In the general case you migth have many more coefficients. I can think
>>of  example where you need  3x32 channels for each material,. This
>>example includes absorption, diffuce reflections and transmission
>>coefficient each with 32 frequency bands, that is 96 channels. We migth
>>not use that high resulotion today but I will definitly need 3x10
>>channels.
>>    
>>
>
>having 32 or 96 output is no problem, but you wont have separate for
>diffusion, reflection and abssorbtion that is what the tree is for. The
>graph can coumput how a sound from a specific angle reflected and absorbed
>by the surface. look in to the differet types of fragemst and you will
>find that there are allready every parameter you should need.
>
>You talk about how many bands are needed, and that worrys me some what.
>You should be able to define a material with as many or few bands as you
>want. the audio rendering application should just interpolate between the
>values of different bands to get what ever is between. Can any one provide
>any graphs of what this data looks like? it would be interestion in order
>to figuer out how to interpolate. with interpolation my gut feeling tells
>me you are not going to be able to hear 32 bands.
>  
>

Your gut feeling if wrong, 32 bands are an approximation of the 
resolution of the hearing that is called critical bands.

>
>  
>
>>There is an alternative solution using the geometry fragment and storing
>>the coefficients in, let say in the red layer in a geometry node and
>>having one output fragment for each type of property you need to
>>represent. We then need to have output types defined for the different
>>properties, as we know today we need absorption, diffuce reflections and
>>transmission. This gives us a per object material represantation.
>>    
>>
>
>First of all there is no susc thing as "red" layers there are only layes
>and if they are used for colors or audio or anythig else doesnt matter.
>All this can already be fone with a material graph since they can take in
>data form a
>geometry layer so that isnt a problem. You will still need to have
>multiple outputs for different bands.
>  
>
You should at least try to understand what im saying, I'm taking about 
that in the geometry fragmet there is a thing call layer_r, my idea was 
to use that to point to a layer in the current geometry node containing 
the data array.

>I realy recomend that you look in to more deaply the way colors of
>materials are handled in verse, i think it will be very close to what you
>are looking for.
>  
>
The problem is that sound is not light.

>E
>
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>
>  
>
--PLu
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