movement facing climbs and slopes

[crivipro]

Hello, I have a terrain with climbs and slopes and a ant character that moves straight between diferent points randomly. Well, I am using this code:

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vector3df CAntCharacter::faceTarget(vector3df targetpos, vector3df nodepos)
{
  core::vector3df posDiff = targetpos - nodepos;
  f32 degree = nodepos.Y; //keep current rotation if nothing to do
  posDiff.normalize();

  if (posDiff.X != 0.0f || posDiff.Z != 0.0f)
    degree = atan2(posDiff.X,posDiff.Z) * core::RADTODEG;

  f32 degreeX = 0;
  //for example:
  //if degreeX is -40 the ant bends over up
  //if degreeX is 40 the ant bends over downwards
  //I need to detect a climb or slope to set the value of degreeX

  return vector3df(degreeX,degree,0);
}

void CAntCharacter::moveto(ISceneNode *node, vector3df vel)
{
    irr::core::matrix4 m;
    m.setRotationDegrees(node->getRotation());
    m.transformVect(vel);
    vector3df nodePosition = node->getPosition();
    node->setPosition(nodePosition + vel);
    node->updateAbsolutePosition();
}

But the thing is when the ant rises a climb I can´t do that the ant bend over up and when the ant descend a slope bend over downwards.

In the code I explain this...
Someone have any idea?

Thanks in advance.

[bitplane]

If it's a terrain node, you can use node->getHeight(x,y) at the front and back, then calculate the angle of the slope.

[crivipro]

Thanks for the answer, I will try it...

Greetings!

[crivipro]

My terrain is a irr file loaded with

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smgr->loadScene("media/terrain.irr");

What I can do?

[bitplane]

Find the terrain node (see the loadIrrFile example) and save a pointer to it.

[crivipro]

Hello, I need to know what is the better physic engine to use following the next points:
- Easy to use
- No extra installations for distribution
- As I am using a terrain loaded from irr file I need to collide with it using the physic engine.

Thanks in advance