**Custom Picking** Create a picking system for identifying when a user has clicked any of the material layers of a v5 shader including projections - [ ] The four material layers can be picked - [ ] The two pattern layers can be picked - [ ] Decals can be picked **CCP Picking** Most shaders contain a picking technique and take `objectID` and `areaID` parameters. - [ ] Identify id format - [ ] Identify how ids relate to the resulting colour