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lots of grass

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mumle:
Hi, im trying to make a scene with a huge amount of grass, but when i make the distrubution-map smaller everything vanishes and it says i have to make it larger... So what are the best way cover a huge surface with grass? And there something special I can do to optimize it?

iToo:
Hi,

There are a couple of parameters that limit the maximum number of items (Display rollout) and maximum density (Distribution rollout). If Forest shows a 'F' icon and doesn't display any items, use the "View Stats" windows (General rollout) to check what is the problem and increase these parameters.

However, there is a good trick to create a grassy field without using a huge number of instances:

- Using Forest, create a grass patch with some hundreds of blades
- In Display rollout, Change "Mode" parameter from "Automatic" to "Meshes"
- Create a new Forest object, taking the grass patch as Custom Object. On this, set Mode to "Automatic" (default value)

... and you get a hierarchy of two Forest objects working together. Adjust parameters to get the desired result.  ;)

For very dense distributions, we usually use a "Full" distribution map, applying a Random Traslation of 20% to avoid the grid effect.

mumle:
Thanks, will look at it tomorrow when im back at work. Loving your plugin  :)

mumle:
It makes it easier to distribute it, but at work we have the pro version and by doing it that way its hard to make it follow a terrain. And as it is now, the most common problem i'm having with grass is the computer crashing when "transforming vertices". We are using vray.

iToo:

--- Quote from: mumle on June 12, 2009, 03:02:57 PM ---It makes it easier to distribute it, but at work we have the pro version and by doing it that way its hard to make it follow a terrain. And as it is now, the most common problem i'm having with grass is the computer crashing when "transforming vertices". We are using vray.

--- End quote ---

Perhaps your grass patch is too large to follow the terrain... have you enabled "Align to Normals" in Surface options ?

No idea about the crashing problem, i would need to check the scene.

I just created a grass test scene, you can use it as help. It uses two linked Forest Pro objects + terrain + VRay, requires Max 2009.

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