void Light::SetIntensitySortValue(const BoundingBox& box)
{
// When sorting lights for object's maximum light cap, give priority based on attenuation and intensity
switch (lightType_)
{
case LIGHT_DIRECTIONAL:
sortValue_ = 1.0f / GetIntensityDivisor();
break;
case LIGHT_SPOT:
{
Vector3 centerPos = box.Center();
Vector3 lightPos = node_->GetWorldPosition();
Vector3 lightDir = node_->GetWorldDirection();
Ray lightRay(lightPos, lightDir);
Vector3 centerProj = lightRay.Project(centerPos);
float centerDistance = (centerProj - lightPos).Length();
Ray centerRay(centerProj, centerPos - centerProj);
float centerAngle = centerRay.HitDistance(box) / centerDistance;
// Check if a corner of the bounding box is closer to the light ray than the center, use its angle in that case
Vector3 cornerPos = centerPos + box.HalfSize() * Vector3(centerPos.x_ < centerProj.x_ ? 1.0f : -1.0f,
centerPos.y_ < centerProj.y_ ? 1.0f : -1.0f, centerPos.z_ < centerProj.z_ ? 1.0f : -1.0f);
Vector3 cornerProj = lightRay.Project(cornerPos);
float cornerDistance = (cornerProj - lightPos).Length();
float cornerAngle = (cornerPos - cornerProj).Length() / cornerDistance;
float spotAngle = Min(centerAngle, cornerAngle);
float maxAngle = tanf(fov_ * M_DEGTORAD * 0.5f);
float spotFactor = Min(spotAngle / maxAngle, 1.0f);
// We do not know the actual range attenuation ramp, so take only spot attenuation into account
float att = Max(1.0f - spotFactor * spotFactor, M_EPSILON);
sortValue_ = 1.0f / GetIntensityDivisor(att);
}
break;
case LIGHT_POINT:
{
Vector3 centerPos = box.Center();
Vector3 lightPos = node_->GetWorldPosition();
Vector3 lightDir = (centerPos - lightPos).Normalized();
Ray lightRay(lightPos, lightDir);
float distance = lightRay.HitDistance(box);
float normDistance = distance / range_;
float att = Max(1.0f - normDistance * normDistance, M_EPSILON);
sortValue_ = 1.0f / (Max(color_.SumRGB(), 0.0f) * att + M_EPSILON);
}
break;
}
}
void PhysicsWorld::GetRigidBodies(PODVector<RigidBody*>& result, const BoundingBox& box, unsigned collisionMask)
{
ATOMIC_PROFILE(PhysicsBoxQuery);
result.Clear();
btBoxShape boxShape(ToBtVector3(box.HalfSize()));
UniquePtr<btRigidBody> tempRigidBody(new btRigidBody(1.0f, 0, &boxShape));
tempRigidBody->setWorldTransform(btTransform(btQuaternion::getIdentity(), ToBtVector3(box.Center())));
tempRigidBody->activate();
world_->addRigidBody(tempRigidBody.Get());
PhysicsQueryCallback callback(result, collisionMask);
world_->contactTest(tempRigidBody.Get(), callback);
world_->removeRigidBody(tempRigidBody.Get());
}
