How to get the normals of a hit point from a raycast?

[Sekaus]

Hi, I have set up a raycast system, it is working fine but I have an issue with finding the normal I hit with the raycast.

Here is how far I got:

RayCastHit RayCast::hit(PhysicsEngine& engine, std::shared_ptr<World> world) {
		JPH::RRayCast ray(origine, direction * maxDistance * 20);
		JPH::RayCastResult result;
		bool hit = engine.getNarrowPhaseQuery().CastRay(ray, result);
		const JPH::Body* body = engine.getBody(result.mBodyID);
		JPH::Vec3 position = origine + direction * result.mFraction;
		if (hit && body != nullptr) {
			JPH::Vec3 normal = body->GetWorldSpaceSurfaceNormal(result.mSubShapeID2, position);
			return { hit, result, normal, position };
		}

		return { false, {}, {}, {} };
	}

[jrouwe]

This line is incorrect:

JPH::Vec3 position = origine + direction * result.mFraction;

the fraction is relative to ray.mDirection which is not the same as direction.

[Sekaus]

Is this better?

JPH::Vec3 position = ray.mOrigin + ray.mDirection * result.mFraction;
		if (hit && body != nullptr) {
			JPH::Vec3 normal = body->GetWorldSpaceSurfaceNormal(result.mSubShapeID2, position);
			return { hit, result, normal, position };
		}