Intersect(Ray, Capsule)

[shadd3]

hello,
thanks for your work.

I embeded your library within a native/android application
(Im3d on PC Version / my application runs correcly)
but on the android version, the axis selection does not work

due to an issue with Intersect (see t0 & t1 )

bool Context::gizmoAxisTranslation_Behavior(Id _id, const Vec3& _origin, const Vec3& _axis, float _snap, float _worldHeight, float _worldSize, Vec3* _out_)
{
......
		float t0, t1;  <===== here
		bool intersects = Intersect(ray, axisCapsule, t0, t1);  <===== here
		makeHot(_id, t0, intersects);  <===== here
......
}

bool Im3d::Intersect(const Ray& _ray, const Capsule& _capsule, float& t0_, float& t1_ <==== here) 
{
	//IM3D_ASSERT(false); // \todo implement
	return Intersects(_ray, _capsule);
}

t0 & t1 are not initialized & not filled by Intersect but used by makeHot
workarround : makeHot => /_depth < m_hotDepth &&/ or Intersect => /* t0_ = 0.0f; t1_ = 1.0f;*/

bool Context::makeHot(Id _id, float _depth, bool _intersects)
{
	if (m_activeId == Id_Invalid &&	/*_depth < m_hotDepth &&*/ <==== here _intersects && !isKeyDown(Action_Select)) {
		m_hotId = _id;
		m_appHotId = m_appId;
		m_hotDepth = _depth;
		return true;
	}
	return false;
}

or

bool Im3d::Intersect(const Ray& _ray, const Capsule& _capsule, float& t0_, float& t1_)
{
	//IM3D_ASSERT(false); // \todo implement
	t0_ = 0.0f;
	t1_ = 1.0f;
	return Intersects(_ray, _capsule);
}

regards

[john-chapman]

Hi - thanks very much for reporting this. As you noted it's a bug in Intersect(ray, capsule) - actually it's just not implemented!

For now I think I'll add your workaround (the second one) as a quick fix; it means that overlapping gizmos with capsule bounds won't work correctly (the hit will be on the first one you test, not the nearest one). I'll leave the issue open and rename it to match the core problem.