forge-pinch-zoom

customized iPad/IPhone/Android pinch zoom touch controls for ForgeViewer

Found a much more pleasing way... On touchend event, set the pivot to the center of the canvas. This is simple and very intuitive for navigation.

Try the demo on your iPad or Android Tablet. Click the link here:

DEMO: https://wallabyway.github.io/forge-pinch-zoom

or scan the QRCode:

Goal:

• Pinch zoom sets zoom point to pivot.
• Rotation is always turntable style.
• When panning with two fingers the model must not be rotated.

Resources:

Steps:

• https://www.keanw.com/2017/04/fixing-pinch-zoom-in-forge-viewer-applications.html
• https://forge.autodesk.com/blog/lock-rotation-around-z-viewer

And this…

viewer.navigation.setPivotPoint({x: -0.7180065711871748, y: -11.258963707247002, z: 0})

Need to do a RAYHIT on mouse up (touch event) to the center of the screen. Get the result x,y,z , if something 'hit', set pivot to that x,y,z.

If no hit on mouse up, do not update pivot point.