height calculations

[ennobee]

Is there a way to calculate the height of a point from the height bitmap?
The bitmap is made out of gray pixels ranging from 0 (pitch black) to 255 (white), but how high would a plateau be if I were to paint it pitch black, half black, etc? Is there a formula for this? Is it some setting in the first lines of the *.scn files?


'Niklas

[TreeHugger]

Hi,

the maximum height of a black point is 64 meters with the ground (white) beeing at 0m. The distribution in-between is linear, so medium gray equals 32m. There is no way to scale this within the .scn-file as far as I know.

If you want to check, built a heightmap that consists of just a white and a black half. Position yourself on top of the cliff and throw an airplane across the abyss. Fly somewhat level and the altimeter will tell you the height above ground.

Regards

[ennobee]

Thanks. So 1 grayscale equals about 25cm of height. Good enough for me.

For now, my highest objects are sand dunes, so 50 m (or rgb=56,56,56) is about the highest I need.

This is unless I ever decide to model the cliffs at Cap Griz-Nez for power soaring, but before I ever get that far, FMS2.99 will be out and I'm sure it will have a feature especially designed for the French Channel.

'Niklas