Terrain with vegetation

[Uther]

Hello, i try to search panda3d sample with terrain and vegetation
like this video

but only demo found is this : https://github.com/tobspr/RenderPipeline-Samples/tree/master/08-Terrain

but this demo is not like youtube video, and this demo have no forest and 3D grass

Where found sample terrain with three and grass ?
i’m started with panda3d, i have a medium experience with unity engine but i want to use open source and freedom engine,
I hesitate between panda3D and orgre 3D

My project, i want to create (easily, i want to code with hight level langage like python or lua, no opengl),
i want to create just a 3D map no game, with 3D terrain (with mountain, water, grass and three) and add road and building for simulate cars in city

*i see how create 3D terrain with multi texture (for create snow in mountain, road…)

Developing a city builder terrain engine

I’m not using custom shaders. I’m a complete noob with this stuff and for now I want to learn/use as much built-in stuff as possible. That’s been the base I have been working off. As I understand it from looking at the code and playing around, it applies the first texture to everything (what would be the texture for alpha1 from l3dt), then using alpha maps replaces textures 2 and 3 (splatting). Finally it takes the full map texture and blends it with everything. The issue is I cannot figur…

*i see how can i load object (building tower for example) and export object to egg/bam or gz compressed with blender3D

but i have 3 problems :

1. i don’t found any example for create three and 3D grass

2. i found basic water sample but is there a more realistic example? water with waves?
   like this :
   water surface simulation with fshader

3. Actualy i try to create collision detection with terrain then put my objects there without crossing the map…
   I’m currently working on the ODE or bullet physics engine, I don’t know which is the most interesting to use for my project?
   I would like my objects to detect the map and not cross it
   I would like my objects to collide with each other
   which physics engine should I use?