I use DAZ Bryce quite a bit to render landscapes. A useful feature is the capability to “stack” terrains. Stacked terrains offer a quick way of adding trees or rocks. Here’s a simple mountain terrain rendered in Bryce.
To add trees I duplicate the terrain then modify it in Bryce’s terrain editor. Generally I first add a bit of height and slope noise so the result will be more interesting. The terrain editor can add “spikes” to a terrain bump map. This can be done at several resolutions. In the screenshot of the terrain editor below you can see spikes added to a terrain map. The size and number of spikes generated vary with the resolution chosen. Here the resolution is very low so that you can see the spikes, they are not just dots. Simple dots would probably render as cylinders, not cones. You can see a rendered view at top right. When rendered in Bryce some of the cones are truncated.
When the two terrains are rendered together the spikes of the “tree” terrain protrude through the original terrain. After selecting a texture for the “trees” there are a number of ways to further modify the terrain. By simply raising or lowering the tree terrain relative to the original you can vary the size and number of visible trees. Areas without trees and treelines can be made my editing the bump map. Such tree layers work best for mid-range or background terrains. With a bit of work you can a quite realistic image.
I wondered if I could do something similar in Howler, so I rendered a terrain bump map with spikes, or trees, in 3d Designer; this is the result. The grass color was set as a reddish hue to resemble soil or conifer needle duff. Snow and rock were set as similar shades of green.
As you can not work simultaneously with multiple bump maps in 3D Designer it would be necessary to edit the bump map to make areas without trees, such as on the peaks and steep, rocky slopes. A better texture map and some method of distorting the trees, so they do not render merely as smooth cones, would improve the results. Post processing might be required to distort them for added realism. I usually have to do the same thing for trees rendered this way in Bryce.