Face tracking: pass through preserveDrawingBuffer prop to WebGLRenderer #242
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Used for face tracking with Three.js Face Mesh.
Setting this property to true lets the rendered canvas be redrawn, allowing for screenshots of the face mesh. In my case, this is done with html2canvas. If the property is not set to true, html2canvas is not able to capture it.
Since this can theoretically lead to degraded performance, it should be an optional property. Therefore, in this implementation, it is an optional property read into the constructor for MindARThree.