What is the problem of decal example in phone just.
With mouse no problem but touch event no match .
It’s just a demo, so it doesn’t need to cover every use-case. Right now it only has mouse event listeners:
window.addEventListener( 'mousedown', function () {} );
window.addEventListener( 'mouseup', function () {} );
If you want to add touch events to your version, you could add your own touch event handlers.
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In my ‘modern subject matter’ version of the DecalGeometry, I have added support for touch events. See the source, lines 51-57
https://sbcode.net/extra_html/game.html (tested in IOS Safari)
Aa thank you very much.
If you developp your game, it will be very interesting , covid virus game 
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