Add Steep Terrain Collision Detection TGEA 1.8.1

I needed a simple method of calling a function from script when the player was on a steep terrain slope.
Steep being defined by the playerdata datablock variables: runSurfaceAngle and jumpSurfaceAngle.

This will work best for missions with flat terrains where you slope the edges of the terrain to form cliffs/walls, because it will trigger for even small steep bumps and irregularities in the terrain which fall above the threshold set by the above variables.

In player.cpp look for:


// shake camera on ground impact
if( bd > mDataBlock->groundImpactMinSpeed && isControlObject() )
{
F32 ampScale = (bd - mDataBlock->groundImpactMinSpeed) / mDataBlock->minImpactSpeed;

CameraShake *groundImpactShake = new CameraShake;
groundImpactShake->setDuration( mDataBlock->groundImpactShakeDuration );
groundImpactShake->setFrequency( mDataBlock->groundImpactShakeFreq );

VectorF shakeAmp = mDataBlock->groundImpactShakeAmp * ampScale;
groundImpactShake->setAmplitude( shakeAmp );
groundImpactShake->setFalloff( mDataBlock->groundImpactShakeFalloff );
groundImpactShake->init();
gCamFXMgr.addFX( groundImpactShake );
}

immediately after this add:

VectorF cNormal;
bool jmp = false, run = false;
findContact(&run,&jmp,&cNormal);
if((!run && !jmp) && (collision->object->getTypeMask() & TerrainObjectType))
   {
   if (!isGhost()) 
      {
      char normal[256];
      dSprintf(normal,sizeof(normal),"%g %g %g",collision->normal.x, collision->normal.y, collision->normal.z);
      Con::executef(mDataBlock,"OnSteepTerrain",scriptThis(), normal);
      }
   }

Recompile the source.
Setup your two variables, and add your new function in player.cs

datablock PlayerData(PlayerBody)
{
   ...
   runSurfaceAngle  = 55; // change these values to suit your needs
   jumpSurfaceAngle = 55;
   ...
}

function Armor::onSteepTerrain(%this, %obj, %vec)
{
   echo ("Contact with Steep Terrain");
}

This should all be working ok, but I've not yet extensively tested it, so feel free to add to it if necessary.

Ian.