Using CSG

[Aidoru]

Hello,

I'm trying to use realtime CSG, but rendering is really slow. 

I tried to use animation but it doesn't work,  so i put code in registerBeforeRender function:

scene.registerBeforeRender(function () {

            boxCSG = BABYLON.CSG.FromMesh(box1);
            cylinderCSG = BABYLON.CSG.FromMesh(cylinder);
            boxCSG = boxCSG.subtract(cylinderCSG);
            var newBox = boxCSG.toMesh("test", null, scene, false);
            cylinder.position.x -= 1;
            box1.dispose();
            box1 = newBox;
        });

box1 and cylinder are simple Mesh created using CreateCylinder and CreateBox

Could someone help me?

Thank you.

[GameMonetize]

Hey!

what is your goal? (You cannot use CSG in  registerBeforeRender because it will be called on every frame)

[Aidoru]

Thank you Deltakosh for your answer,

my goal is to use CSG at runtime, in that example I simply want to cut that box with cylinder, but if I use animation with an event attached I was only able to do it using a position of the cilinder (for example cylinder at x -2), but I want to "cut" all the part of box till stop (for example till x -10) and update box1 without reset it every call.

 

 

[GameMonetize]

I see. you may need to provide a sample repro using the Playground to help us helping you

[GameMonetize]

One reminder though: CSG is not intended to be used in realtime so you have to be cautious when using it

[Aidoru]

So probably the problem is that, I can't use it in realtime. My goal is something like you can see in that video. Do you think there is no way to do something like that?

 

[GameMonetize]

Everything is possible:)

But for this specific case you may end up with doing more code than expected 

[Aidoru]

The problem is that at the moment cutting "animation" is something like: translate in x + cut + render + stop + translate in x + cut + render + stop and so on...., and browser after a little time crash. Do you know any way to get a smooth cut animation? Without stop on every frame e without crash?

 

Thank you

[Wingnut]

Gruesome challenge.

I think... if you switched to wire-frame... and "watched" CSG after CSG activity, you would understand why the browser crashes.  I bet the wire-frame turns into a spaghetti festival... after 3-15 Boolean subtractions (trying to carve a channel). 

A monumental challenge... to do that video... real-time, with webGL.  Way way difficult, I suspect.  Possibly not feasible/plausible, but that's only my low-edu opinion.

[Convergence]

Better to model the finished product and overlay all the grooves with meshes representing chunks that the chisel will 'remove'.

No csg necessary and much better performance. 

[adam]

I bet this could be done with a GroundMesh.  

[Wingnut]

Super-hi-rez heightMap?  nod.  Not really removing vertices... just lowering them to the depth of the cut channel.  phew.  But yeah, that would stand a chance of being successful.  Wow, interesting idea.

[JohnK]

@Aidoru @Wingnut couldn't resist the interesting idea. Went for a sort of semi voxel approach. Not all that successful but kept me happy for a couple of days. Still rather slow loading and slow working and there are more than likely many better ways to achieve a better result. For what it is worth here is a PG

http://www.babylonjs-playground.com/#1Y33PT#0