I have a scene containing the following collision node:

<Collision enabled="true" DEF="GEOMETRY">
<Shape>
<Appearance>
<Material DEF="MATERIAL" />
<FrictionalSurface dynamicFriction="0.6" staticFriction="0.2"/>
</Appearance>
<Sphere radius="0.1" />
</Shape>
</Collision>

I access the collision Node by its def, then call the lineIntersect function on it. As far as I am aware from the documentation, this function should return true if the given line intersects any piece of geometry.

However, I am unable to get it to return "true" even when drawing a line that definitely intersects my sphere -- I can only seem to get a positive response for it intersecting the viewpoint node that is the camera.

All I am interested in is whether or not an intersection has occurred, not any further information.

Am I doing something wrong, or am I missing something?

Did you use a debugger to step through the code to know where it returns false? If it does so at the X3DGeometryNode::lineIntersect and in that case why?

You have understood the documentation correct, it should return true if it intersect any kind of geometry.

Gosh, I'm so sorry, I've just discovered a really glaring, stupid mistake.

It turns out I was leaving my start and end line points behind at the starting point instead of making them relative to the current position!

Really sorry to have bothered you.