Use engine picker.#383
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Pull request overview
This PR replaces the custom depth-buffer based picking implementation with PlayCanvas’ built-in engine Picker, simplifying the picking pipeline used by the viewer (e.g., for double-tap camera refocus).
Changes:
- Removed the custom render-target + shader-chunk depth packing picker implementation.
- Added an engine
Pickerinstance that prepares the scene and queries a world point asynchronously. - Introduced a fixed downscale factor (
pickerScale = 0.25) and clamped normalized inputs to valid pixel coordinates.
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