[sldev] [VWR] morphs, normals, and binormals

[Richard Nelson]

Normal and binormal morphs are implemented such that they are additive as  
well.  This is a requirement, since we apply the morphs incrementally, and  
the customization interface allows you to set the morph values in any  
order.

Technically, we store normal morphs as vector displacements that are  
applied to the initial normal.  At one point, it was the half-angle that  
was stored as a displacement, to keep the small angle approximation as  
valid as possible (we then reflect the initial normal about the displaced  
normal to get the actual result).  It's not clear from looking at the code  
that we still do that.

http://en.wikipedia.org/wiki/Small_angle_approximation

Regardless, you shouldn't have to worry.

R.

On Wed, 02 Jan 2008 08:31:57 -0800, Mike Monkowski  
<monkowsk at watson.ibm.com> wrote:

> The viewer uses delta morphs that include displacements as well as  
> normals and binormals.  I would like to combine two morphs so that the  
> result is the same as if both were applied simultaneously.  I know that  
> the displacements can just be added, but what about the normals and  
> binormals?  Any 3D graphics experts out there? :-)
>
> Mike
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