[fluxus] (build-polygons) and normals

[Dave Griffiths]

>> Hi all,
>>
>> I've been playing around with (build-polygons) this afternoon, and have
>> made a nice tetrahedron (attached), practice for making more
>> interestingahedra.
>>
>> But, it is about 1/4 the brightness of a cube of the same nominal
>> colour, and activating (hint-normals) shows that it has 1 normal per
>> vertex, whereas the cube has 3, and the tetrahedron's normal is rather
>> short.
>>
>> I am using (recalc-normals) to create the normals, because I don't know
>> any other way.  How would I specify the normals properly?
>
> couple of things here, one the recalc normals generates the geometric
> normals, then goes ahead and automatically smoothes them - so you're
> seeing three coincident normals there. the other thing is that it appears
> the normal isn't renormalised after smoothing, which is a dave-bug :)
>
> I'll add a switch to recalc-normals to disable the smoothing, and fix the
> renomalisation bug.

fixed in the pre-0-9 branch + docs updated

(recalc-normals) changes to (recalc-normals smooth) - 0|1
only has effect on poly prims, as nurbs will always be smooth.

cheers,

dave