bool LineConeIntersection(IVRenderInterface *pRenderer, const hkvVec3 &vConePos, const hkvVec3 &vConeAxis, float fConeAngle,
const hkvVec3 &vLineStart, const hkvVec3 &vLineDir, hkvVec3 &vIntersection)
{
// cull back cone
float fConeLineAngle = vConeAxis.dot(vLineDir);
if (fConeLineAngle < 0)
return false;
float fCosAngle = hkvMath::cosDeg(fConeAngle);
float fCosSquared = fCosAngle*fCosAngle;
hkvVec3 vLineToCone = vLineStart - vConePos;
float fDotA = vConeAxis.dot(vLineToCone);
float fDotB = vLineDir.dot(vLineToCone);
float fDotC = vLineToCone.dot(vLineToCone);
float a = fConeLineAngle*fConeLineAngle - fCosSquared;
float b = fConeLineAngle*fDotA - fCosSquared*fDotB;
float c = fDotA*fDotA - fCosSquared*fDotC;
float fInnerValue = b*b-4*a*c;
float fDenominator = 2*a;
if(fInnerValue < 0.0f || fDenominator == 0.0f)
return false;
float fSqrtInnerValue = sqrt(fInnerValue);
float t1 = (-b + fSqrtInnerValue)/fDenominator;
float t2 = (-b - fSqrtInnerValue)/fDenominator;
// choose front cone
float t = (t1 > t2) ? t1 : t2;
vIntersection = vLineStart+vLineDir*t;
return true;
}
hkvVec3 RPG_Explosion::GetHerringBoneImpulse( hkvVec3 const& position )
{
hkvVec3 impulse(0.0f, 0.0f, 0.0f);
hkvVec3 attackLine = m_direction;
attackLine.z = 0.0f;
attackLine.normalize();
float const lineProjection = hkvMath::Max(0.0f, position.dot(attackLine) - m_center.dot(attackLine));
hkvVec3 const& closestPointOnAttackLine = m_center + lineProjection * attackLine;
impulse = (position - closestPointOnAttackLine);
impulse.z = 0.0f;
float distanceLineToImpact = impulse.getLengthAndNormalize();
if(hkvMath::isFloatEqual(0.0f, distanceLineToImpact))
{
if(Vision::Game.GetFloatRand() > 0.5)
{
impulse.x = attackLine.y;
impulse.y = -attackLine.x;
}
else
{
impulse.x = -attackLine.y;
impulse.y = -attackLine.x;
}
}
impulse += attackLine;
impulse.normalize();
float const strengthScale = hkvMath::Max(0.0f, (m_length - lineProjection) / m_length) *
hkvMath::Max(0.0f, (m_radius - distanceLineToImpact) / m_radius);
impulse.z = 0.1f;
return impulse * strengthScale * m_impulseStrength;
}
bool VWallmarkManager::IsTracePointOnPlane(const hkvVec3& vPos, const hkvVec3& vNormal, float fTraceRad, float fEpsilon, hkvVec3& vNewNormal)
{
hkvVec3 vStart = vPos + vNormal*fTraceRad;
hkvVec3 vEnd = vPos - vNormal*fTraceRad;
#ifdef WALLMARKS_USE_VISION_TRACELINES
VisTraceLineInfo_t result;
if (Vision::CollisionToolkit.TraceLine(vStart,vEnd,(ULONG)VIS_TRACE_ALL,(ULONG)VIS_TRACE_NONE,NULL,NULL,&result))
return false; // no hit
// only allow wallmarks on static geometry and terrain
if (result.hitType != VIS_TRACETYPE_STATICGEOMETRY && result.hitType != VIS_TRACETYPE_TERRAIN)
return false;
if (hkvMath::Abs (result.distance - fTraceRad)>fEpsilon)
return false;
// too much deviation from plane normal
vNewNormal = result.primitivePlane.m_vNormal;
float fDot = vNewNormal.dot(vNormal);
if (hkvMath::Abs (fDot-1.f)>fEpsilon)
return false;
#else
IVisPhysicsModule_cl *pPhysMod = Vision::GetApplication()->GetPhysicsModule();
VisPhysicsHit_t result;
if (pPhysMod==NULL || !pPhysMod->Raycast(vStart,vEnd,result))
return false;
// only allow wallmarks on static geometry and terrain
if (result.eHitType != VIS_TRACETYPE_STATICGEOMETRY && result.eHitType != VIS_TRACETYPE_TERRAIN)
return false;
if (hkvMath::Abs ((result.fHitFraction - 0.5f)*fTraceRad)>fEpsilon)
return false;
//NOTE: result.vImpactNormal is the interpolated vertex normal and thus not useful here
vNewNormal = vNormal;
#endif
// Vision::Game.DrawSingleLine(vPos,vPos+vNewNormal*20.f);
return true;
}
