Re: [Algorithms] Terrain Normals

[Jim O. <j.o...@in...>]

Hi,

> How can your bilinear filtering method (as depicted below) be used with
the
> terrain layout (as depicted at bottom, the same as mine)?

A bit of flexible thinking I guess... Your (and my) terrain representation
is actually just an approximation of the 'actual' terrain (that is, there
are very few places to be found in the universe where a terrain is made up
of countless triangles in a regular grid). This 'flaw' can produce
unrealistic images (gray bands, for instance). By using a different method
to calculate the normals, I kinda masked the problem(*).

(*) I first used all eight surrounding triangles, but I found that using
only four gave nearly the same result, up to the point where it was no
longer visible.

Jim Offerman

Innovade
- designing the designer