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Shades of the WAVE effect (almost!) working.
small improvements in DISTORT
Better normals in DISTORT
Vertex positions fully 3D now. Remaining: normals!
Preparation to make the WAVE effect fully 3D
Adjustments for EffectQueueVertex.postprocess()
Improvements for WAVE
Beginnings of the WAVE effect.
Correct an important bug in the vertex shader.
b = 1/a if a!=0, 1 otherwise was incorrectly computed as b = 1.0 / (a+1.0-sign(a)). This, when 0<a<2^-24, suffers from 'round-off error': then a+1.0 = 1.0 (sic!) thus b = 1/0 !.
Correct way: b = 1.0 / ( a - (sign(a)-1.0) )
Fix for Bug #17: Regions of Fragment Effects migrate.
Fix is: don't send vertex position and the Fragment Effect region to the fragment shader already multiplied by the ModelView matrix (that introduces the imprecise interpolation because of the projection effect) but simply send both of them in local coords.
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