mesh in a mesh intersection

[Ghostdog]

Hi,

regarding a sphere in a sphere scenario, I would like to ask ..

 

1) Is intersection possible for an inner intersection event of the spheres?

- If I take  BABYLON.ActionManager.OnIntersectionExitTrigger  this state will be reached if the small inner sphere is more than the half out of the outer sphere

- If I take  BABYLON.ActionManager.OnIntersectionEnterTrigger this state will be reached direct the scene is started

..  and I need exact the intersection if a small inner sphere touches the inner wall of the outer sphere  How to do?

 

2) How can a given sphere segment have materials on both sides of the mesh? At the moment I can give some material & color to the segment but if the segments turns around it is not to see anymore.

My first thought was going in direction of backface culling or the DOUBLESIDE option 

var sphere = BABYLON.MeshBuilder.CreateSphere("sphere", {segments: 25, diameter: 5, arc: 1.0, slice: 0.2}, scene, false, BABYLON.Mesh.DOUBLESIDE);

but it not seems to help.

How to bring on some color to the inner side of the mesh, without having an inverse second mesh?

 

Thanks and with best regards,

Stefan

[aWeirdo]

Hi, 
please create a PG displaying your issues;

http://www.babylonjs-playground.com/

[JohnK]

A playground would definitely help. However MeshBuilder does not have any parameters after scene, sideOrientation is set as a property inside the options parameter check docs for http://doc.babylonjs.com/tutorials/Mesh_CreateXXX_Methods_With_Options_Parameter#sphere

 

 

 httphttp 

[Ghostdog]

YES, of course!

http://www.babylonjs-playground.com/#1SWPNU#5

In here I added both of my problems..

- I am in need for an inner intersection mesh scaling and in need to got the material on both sides of the segment

 

With best regards,

Stefan

[Ghostdog]

.. I for now go on with double meshes by extend a second mesh wit .scaling.x = -1 for an inverse second mesh.

For the intersec solution I may will take an invisible sphere as bounding mesh with a radius that fits the delta..

 

Thanks for the highlighs! 

[jerome]

for the double sided sphere, just set the parameter sideOrientation inside the {} : http://www.babylonjs-playground.com/#1SWPNU#6

[jerome]

Mesh intersection is computed according to the bounding boxes and bouding spheres... so when a mesh is "inside" another mesh, its bounding boxes and spheres necesseraly intersect. Consider the term "intersection" not like crossing each other, but more like sharing a common part of their bounding box and bouding sphere. So when one is fully included in the other, it intersects it.

 

[Ghostdog]

Great!!  thank you for the right solution!