solved Canvas2d/Rect2d - Small .scale - interesting error

[Wingnut]

Hi gang.  In this playground... play around with mousewheel unzooming... until rect2d is tiny dot.  Play with mousewheel there, while small.  Keep playing... in/out... until...

Error: Can't invert matrix, near null determinant  babylon.canvas2d.js:185:23

Extra stackdump data...

Matrix2D.prototype.invertToRef https://preview.babylonjs.com/canvas2D/babylon.canvas2d.js:185:23
    Matrix2D.Invert https://preview.babylonjs.com/canvas2D/babylon.canvas2d.js:144:13
    Prim2DBase.prototype.updateCachedStates https://preview.babylonjs.com/canvas2D/babylon.canvas2d.js:9337:48
    Prim2DBase.prototype.updateCachedStatesOf https://preview.babylonjs.com/canvas2D/babylon.canvas2d.js:9144:17
    Group2D.prototype._prepareGroupRender https://preview.babylonjs.com/canvas2D/babylon.canvas2d.js:11928:17
    Canvas2D.prototype._updateCanvasState https://preview.babylonjs.com/canvas2D/babylon.canvas2d.js:18228:13
    Canvas2D.prototype._render https://preview.babylonjs.com/canvas2D/babylon.canvas2d.js:18239:13
    Canvas2D/_this._afterRenderObserver< https://preview.babylonjs.com/canvas2D/babylon.canvas2d.js:17036:25
    e.prototype.notifyObservers https://preview.babylonjs.com/babylon.js:2:30355

The error kills the canvas2d and the prims.  They vanish... leaving the user saying "woah, dude", or something similarly profound. 

I tortured the poor .scale property (for the mainRect... in the renderLoop) and made it barf.  Rectangular barf!    

Just passing it along.  (eww)

I almost made a Trello card on @Nockawa's Canvas2D Trello site, but they wanted me to JOIN something, and I couldn't handle all that added responsibility.  :/

[AlbertTJames]

Edit: probably unrelated issue. Sorry for the spam.

[Wingnut]

Hi ATJ!  Your words are NEVER spam.  I always enjoy reading your comments, no matter where you put them.

But, yeah, Nockawa and other Canvas2D superheroes might not see your issue, here. 

Feel free to start a new Q&A or Bugs thread, of course. 

As you likely know, Canvas2D is still in-development - work in progress.  I think some positioning/origin changes happened to the primitives about 3 months ago.  I think Nockawa talks about those things... in some threads in Announcements sub-forum.  You probably knew all that, already. 

Good to see you again... hope you're well.

[adam]

This should probably be Epsilon rather than 0:

https://github.com/BabylonJS/Babylon.js/blob/master/canvas2D/src/Engine/babylon.prim2dBase.ts#L2319

http://www.babylonjs-playground.com/#2WHFP1#3

[Wingnut]

Adam, you're just a God!  sigh.  I wish I had a brain like yours. 

Yep... when we get near zero or near poles... a guy should instantly think 'Epsilon' (micro-value).

Thanks Adam!  Well done.