change of world for roaming-ralph-tutorial not working

hi everybody,
i am new to panda3d.in roaming-ralph-tut i tried to replace the world.egg with my own terrain.egg file created with blender2.61.i added a start_point object(an empty object in blender) before exporting as egg file.

 when i run the program ralph is not changing its position on the new terrain,only playing animations, when i give keyboard inputs.

can anybody help me to solve the problem.thanks in advance

Your ground still needs to have collision information. The easiest way to do this is by selecting your ground, going to the Logic tab in Blender, and adding a property called “Collide”, and setting it to “Polyset keep descend”. This will make Chicken copy the terrain and used the copy as collision mesh.

I’m assuming you’re using the Chicken exporter. I have no idea how this is done with Yabee, but I assume that the Yabee manual covers how to do this.

thanx rdb .but i am using yabee exporter.is it possible to use chicken exporter with blender 2.61

No, I don’t believe it is.

solved finally its working.i exported the egg file from blender
opened the egg file in text editor change the name of the
Group from Cube(name of my exported object) to terrain and added the following line to the code inside the group and saved it. now its working

{ Polyset keep descend }


so my final simple egg file is as follows

{ Z-Up }

{
“egg-trans -tbnall -o /home/anshuman/Documents/panda3D/blend2egg/start_pointCube.egg /home/anshuman/Documents/panda3D/blend2egg/start_pointCube.egg”
}

terrain {
{ Polyset keep descend }
Cube {
0 {
7.828 7.828 -0.237
}
1 {
7.828 -7.828 -0.237
}
2 {
-7.828 -7.828 -0.237
}
3 {
-7.828 7.828 -0.237
}
4 {
7.828 7.828 0.237
}
5 {
-7.828 7.828 0.237
}
6 {
-7.828 -7.828 0.237
}
7 {
7.828 -7.828 0.237
}
}
{
{ 0 0 -1 }
{ 0 1 2 3 { Cube } }
}
{
{ 0 0 1 }
{ 4 5 6 7 { Cube } }
}
{
{ 1 0 0 }
{ 0 4 7 1 { Cube } }
}
{
{ 0 -1 0 }
{ 1 7 6 2 { Cube } }
}
{
{ -1 0 0 }
{ 2 6 5 3 { Cube } }
}
{
{ 0 1 0 }
{ 4 0 3 5 { Cube } }
}
}

start_point {
{
{
1 0 0 0
0 1 0 0
0 0 1 0
-0.816 -2.818 0.713 1
}
}
}