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 Generating Forest  (Read 871 times) 0 Members and 1 Guest are viewing this topic.
 « Posted 2011-05-19 01:56:31 »

Hello,

I'm trying to generate a realistic forest for a RTS like game. But I would need some tip about how to do it.

My guess is that I need to use Perlin Noise as it seems to do pretty much what I want to do. The problem is that I don't understand how to pass from a function like the one showed in this thread (Perlin Noise by DzzD) to a sort of array[][] containing value to indicate where to place my trees.
m77

 « Reply #1 - Posted 2011-05-19 03:48:59 »

u can calculate position of each next tree by algorithm like this:
void placeTree() {
x = random.nextDouble()*mapWidth;
y = random.nextDouble()*mapHeight;
double dist = distanceTillTheClosestTree()
if (dist < minDist) {
placeTree();
} else if (random.nextDouble()*k > dist) {
placeTree();
}
}
lhkbob

JGO Knight

Medals: 32

 « Reply #2 - Posted 2011-05-19 06:12:41 »

Perlin noise is the generally a good way to place trees.  Often, they increase the contrast of the noise image by picking a threshold value.  All points above that are moved to 1 and all below are at 0. Alternatively you can go more detailed and pick a couple of thresholds to create bands.  Within each of these bands you have a tree density and you place trees to fill up the density.

One way of doing that is by splitting up the map into a grid maybe large enough to hold 3-5 trees max.  Then when randomly placing trees in a band, you figure out approximately how many trees go in each grid, and use random() to place them within the grid.  This should give you a more even density in the band while giving the appearance of randomness.

There might be smarter tree placement algorithms though.

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