c++ - How to use PxOverlapCallback in NVIDA Physx for overlap queries

Question

I’m trying to use Physx to perform an overlap query on my scene, but am having trouble based off of the documentation. I am following the information here: Scene Queries — NVIDIA PhysX SDK 4.1 Documentation

Based off of the example in the SDK Guide, I created my own callback class, inheriting from PxOverlapCallback:

    struct OverlapCallback : physx::PxOverlapCallback {
        OverlapCallback(userData* userData)  : physx::PxOverlapCallback(NULL, 0)  {
            mUserData = userData;
        }

        physx::PxAgain processTouches(const physx::PxOverlapHit* buffer, physx::PxU32 nbHits) {
            std::cout << "Number of overlap hits: " << nbHits << std::endl;
            return true;
        }

        void finalizeQuery() {
            std::cout << "Finalizing query" << std::endl;
        }

        userData* mUserData;
    };

However, if I utilize this callback function, I get an error from Physx:

physxsrc53e20a06fa-b4a222d4bd.cleanphysxsourcephysxsrcNpSceneQueries.cpp (709) : invalid parameter : PxScene::overlap() and PxBatchQuery::overlap() calls without eANY_HIT flag require a touch hit buffer for return results.

But isn’t the point of using the callback that I don’t need a buffer? The default flag for overlap queries should be eNO_HIT, so I’m not sure why I’m getting this error.

thanks in advance for any pointers or help you can provide!

question from:https://stackoverflow.com/questions/65910034/how-to-use-pxoverlapcallback-in-nvida-physx-for-overlap-queries

Answer 1

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