[Bf-committers] two new wood types and one new wood wave type

Chris Burt desoto at exenex.com
Sun Dec 11 22:25:23 CET 2005

It should be noted that the cylindrical behavior is already easy to 
create on the map input panel but toying for a moment with the buttons 
in the lower left hand corner. You can also select whichever axis you 
want in this way which is more flexible. The cone feature sounds nice 


Ed Halley wrote:
> This provides two important new "wood" texture types, called tubes and 
> cones.  Real trees are not like onions:  they do not grow concentric 
> spherical rings as they grow older.  This provides two ring formats 
> which may help make better woodgrains.
> In the simpler sense, trees are more like cylinders than spheres.  I 
> added a 'tubes' formula which offers this arrangement of rings.  The 
> axis of the tube is the Y axis.  I chose the Y axis so that it would 
> appear differently in the texture preview, since choosing the Z axis 
> would make it appear exactly like the existing spherical rings.
> In the even more accurate case, trees grow rings in a conic formation. 
> The ring representing the winter of 1980 in a giant pine tree exists at 
> half of the outer radius near the ground, but is very small when you 
> climb halfway up.  The newest growth at the top does not have this ring 
> at all.  Again, this format chooses the Y axis to represent the 
> direction of growth.
> There is no simple math which will produce knots, as those are the 
> result of new branches rooting from the bole of the tree.  But even if 
> you're not trying to model realistic woodgrain, these two new formats 
> may offer some interesting new conic patterns for artists.
> I also expanded the set of waveforms to include a "sharp at 1, smooth at 
> 0" rectified sine wave.  I call this a "cup wave."  This may be of 
> interest in some situations, but honestly, I added it because it was 
> simple.
> This patch does NOT redesign the selection of geometries into a more 
> appropriate pair of parameters, shape and noise.  There should not be a 
> choice for "noisy rings" and "noisy cones" and so on, but instead a 
> toggle button which represents noise and a simple list of shapes.  I 
> still think this redesign should be done sometime, as the switch case 
> for all these types is kind of annoying to maintain and add new cases.
> Please, by all means, any comments or criticisms, let me know.
> -- 
> [ e d @ h a l l e y . c c ]
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