//DNM_tdstMecObstacle g_a_stObstacle [COL_C_xMaxNumberOfCollisions];
DNM_tdstMecObstacle *g_a_stObstacle = (DNM_tdstMecObstacle *) COL_g_stCollisionCase;
ACP_tdxBool g_bWaterNoCollide;

ACP_tdxBool MEC_fn_bCollision ( long* p_lObstacle, DNM_tdstMecObstacle *p_stObstacle, struct DNM_stDynamics* p_stDynamic, HIE_tdxHandleToSuperObject p_stSupObj, POS_tdstCompletePosition *p_stStartPosition, POS_tdstCompletePosition *p_stEndPosition, ACP_tdxBool bBackFace )
{
	long lCounter;
	DNM_tdstMecObstacle *p_stTmpObstacle;
	DNM_tdstMecObstacle stHandObstacle;
	POS_tdxHandleToPosition hSupObjMatrix;
	MTH3D_tdstVector stMove, stVector;
	MTH3D_tdstVector *p_stStartTranslation, *p_stEndTranslation;
	MTH3D_tdstVector *p_stX, *p_stY, *p_stZ;
/* XB 05/05/99 */
/* 	ACP_tdxBool bIndexedTriangles = FALSE; */
/* End XB 05/05/99 */
	ACP_tdxBool bObstacleOk = FALSE;
	MTH_tdxReal xDotProd;
	ACP_tdxBool bWaterFace = FALSE;
	MTH_tdxReal xDotProdMax;

	*p_lObstacle = 0;
	xDotProdMax = MTH_C_MinusONE;

	*p_lObstacle = COL_lHaveITakeSThgIntoTheMug (p_stObstacle, p_stSupObj, p_stStartPosition, p_stEndPosition);

	/* delete back faces */
	if (!bBackFace) MEC_fn_vDeleteBaseBackFace ( *p_lObstacle,p_stObstacle, p_stDynamic );

	MEC_fn_vDeleteNoCollidedGroundFace (*p_lObstacle,p_stObstacle,p_stDynamic);

	if (*p_lObstacle<=0) return FALSE;

	if (DNM_M_bDynamicsIsHanging(p_stDynamic))
		MEC_fn_vDeleteHangingObstacle (*p_lObstacle,p_stObstacle,p_stDynamic);

	p_stStartTranslation = POS_fn_p_stGetTranslationVector (p_stStartPosition);
	p_stEndTranslation = POS_fn_p_stGetTranslationVector (p_stEndPosition);
	MTH3D_M_vSubVector ( &stMove, p_stStartTranslation, p_stEndTranslation );

	MEC_fn_vComputeCollisionTranslation (*p_lObstacle,p_stObstacle,&stMove);

	hSupObjMatrix = HIE_fn_hGetSuperObjectGlobalMatrix(p_stSupObj);
	POS_fn_vGetRotationVector ( hSupObjMatrix, &p_stX, &p_stY, &p_stZ );

	for (lCounter=0; lCounter<*p_lObstacle; lCounter++)
	{
		p_stTmpObstacle = p_stObstacle+lCounter;

		if (MEC_fn_bIsObstacleValid(p_stTmpObstacle))
		{

			ACP_tdxBool bCollisionOk = TRUE;

			/* hands */
			if (MEC_fn_bTypeOfGameMaterial (DNM_M_hObstacleGetMyMaterial(p_stTmpObstacle),C_xDNM_HAND_TYPE_GAME_MATERIAL))
			{
				bCollisionOk = FALSE;
				if (MEC_fn_bTypeOfGameMaterial (DNM_M_hObstacleGetCollidedMaterial(p_stTmpObstacle),C_xDNM_HANG_TYPE_GAME_MATERIAL) )
				{
					/* collide only hand with ground */
					if (MEC_fn_bGroundObstacle(p_stDynamic,p_stTmpObstacle))
					{
						/* choose best hand obstacle */
						MTH3D_M_vSubVector (&stVector,DNM_M_p_stObstacleGetContact(p_stTmpObstacle),POS_fn_p_stGetTranslationVector(hSupObjMatrix));
						if (!MEC_fn_bIsNullVector(&stVector))
							MTH3D_M_vNormalizeVector (&stVector,&stVector);

						xDotProd = MTH_M_xAbs(MTH3D_M_xDotProductVector (p_stY,&stVector));
						if (xDotProd>xDotProdMax)
						{
							xDotProdMax = xDotProd;
							DNM_M_MecObstacleCopyClone ( &stHandObstacle, p_stTmpObstacle );
						}
					}
				}
			}

			/* water */
			else if (MEC_fn_bTypeOfGameMaterial (DNM_M_hObstacleGetCollidedMaterial(p_stTmpObstacle),C_xDNM_WATER_TYPE_GAME_MATERIAL))
			{
				if (MEC_fn_bTypeOfGameMaterial (DNM_M_hObstacleGetMyMaterial(p_stTmpObstacle),C_xDNM_WATER_TYPE_GAME_MATERIAL))
				{

					if (!bWaterFace)
					{

						/* delete water back face */
						xDotProd = MTH3D_M_xDotProductVector ( DNM_M_p_stObstacleGetNorm(p_stTmpObstacle),DNM_M_pObstacleGetZoneMove(p_stTmpObstacle) );

						if (  MTH_M_bGreater ( MTH_M_xAbs ( MTH3D_M_xGetZofVector (DNM_M_pObstacleGetZoneMove(p_stTmpObstacle))), 0.03 )  )
						{
							if ( MTH_M_bLess(xDotProd, MTH_C_ZERO) )
							{
								MEC_fn_vReportCollision (p_stDynamic, p_stSupObj, 1, p_stTmpObstacle, 0);
								/* the obstacle is used for repositionning only if required*/
								bCollisionOk = fn_bBrainWaterCollideSO(p_stSupObj);
								if (!bCollisionOk)
									g_bWaterNoCollide = TRUE;
								bWaterFace = TRUE;
							}
							else
								bCollisionOk = FALSE;
						}
						else
						{


							MTH3D_M_vSubVector ( &stVector, DNM_M_p_stObstacleGetContact(p_stTmpObstacle), DNM_M_pObstacleGetZonePosition(p_stTmpObstacle) );
							MTH3D_M_vAddVector ( &stVector, &stVector, DNM_M_pObstacleGetZoneMove(p_stTmpObstacle) );

							xDotProd = MTH3D_M_xDotProductVector ( DNM_M_p_stObstacleGetNorm(p_stTmpObstacle),&stVector );

							if (MTH_M_bLessEqual(xDotProd,MTH_C_ZERO))
							{
								MEC_fn_vReportCollision (p_stDynamic, p_stSupObj, 1, p_stTmpObstacle, 0);
								bCollisionOk = fn_bBrainWaterCollideSO(p_stSupObj);
								if (!bCollisionOk)
									g_bWaterNoCollide = TRUE;
								bWaterFace = TRUE;
							}
							else
								bCollisionOk = FALSE;
						}

						if (MTH_M_bGreater(MTH3D_M_xGetZofVector(DNM_M_p_stObstacleGetNorm(p_stTmpObstacle)),MTH_C_ZERO))
							bCollisionOk = FALSE;


					}
					else
					{
						bCollisionOk = FALSE;
					}

				}
				else /*we do not report the collision because it does not exist: do not use the obstable for repositionning*/
					bCollisionOk = FALSE;

			}

			else
			{
				/* No collision faces */
				if (MEC_fn_bTypeOfGameMaterial (DNM_M_hObstacleGetCollidedMaterial(p_stTmpObstacle),C_xDNM_NO_COLLISION_TYPE_GAME_MATERIAL))
				{
					/* Climb faces */
					if (MEC_fn_bTypeOfGameMaterial (DNM_M_hObstacleGetCollidedMaterial(p_stTmpObstacle),C_xDNM_CLIMB_TYPE_GAME_MATERIAL))
						bCollisionOk = DNM_M_bDynamicsIsClimb(p_stDynamic);

					/* Gi faces */
					else if (MEC_fn_bTypeOfGameMaterial (DNM_M_hObstacleGetCollidedMaterial(p_stTmpObstacle),C_xDNM_GI_TYPE_GAME_MATERIAL))
						bCollisionOk = DNM_M_bDynamicsIsGi(p_stDynamic);

					/* Other faces */
					else if (MEC_fn_bTestMaskGameMaterial(DNM_M_hObstacleGetCollidedMaterial(p_stTmpObstacle),C_xDNM_COLLISION_REPORT_MASK))
					{
						bCollisionOk=FALSE;
						MEC_fn_vReportCollision (p_stDynamic, p_stSupObj, 1, p_stTmpObstacle, 0);
					}

					/* no report */
					else  bCollisionOk=FALSE;

				}
			}

			if (!bCollisionOk) MEC_fn_vInvalidateObstacle(p_stTmpObstacle);
			else bObstacleOk=TRUE;
		}
	}


	/* report hand obstacle */
	if (xDotProdMax != MTH_C_MinusONE)
		MEC_fn_vReportCollision (p_stDynamic, p_stSupObj, 1, &stHandObstacle, 0);

	return bObstacleOk;
}