Oh yeah sorry, my bad… got carried away with other stuff.
Here we go:
First in a photo editor make sure both the height map and forest area are the same size and directly overlay each other and save them as grey scale for the height map and forest area as bitmap.
Open Bryce and create a new terrain.
Click the Edit Terrain icon to take you to the Terrain Editor window.
Delete terrain that is displayed by clicking the ‘New’ button.
A. In the ‘Editing Tools’ pane, click the ‘Picture’ tab.
B. Click ‘Load’ and navigate to the height map picture you’ve just saved and load it.
C. Click ‘Apply’
Click the tick to accept your changes and go to the main viewport and adjust the Y axis until the height looks correct.
Click the Attributes button (the little ‘A’ in the selected object’s floating sub menu) and change the name to ‘Height’.
Duplicate this terrain, don’t move it at all yet, but go to Attributes and change it’s name to ‘Forest’
Then with forest selected go to the Terrain Editor and follow the same procedure above to get the Forest Area picture loaded.
New we’re going to use the clipping filter to get rid of the top and bottom of the terrain so that hopefully what we are left with is just the area where the trees will be.
D. Click on the very top of the bracket and drag it downward. you will see that above the bracket turns yellow and a corresponding area on the flat preview also turns yellow. You may not have to drag with down very far (if at all), it’s just to get rid of any peaks, but really for what we’re doing here, it’s not essential as you will see.
E. Click on the very bottom of the bracket and drag it upwards. You will see that below the bracket turns red and a corresponding area on the flat preview also turns red. This is the important one here as this is cutting off and therefore making invisible anything below the height you set.
It’s a bit tricky selecting the correct part of the bracket and if you don’t get it just right,and click on the greyscale strip it will simply drag the strip and do something completely different.
Click thumbnail to see full-size image