forge-3d-picking

3D object picking in an SDL GPU project is achieved by using color-ID and stencil-ID techniques to map screen pixels to object indices, enabling pixel-precise selection during interactive rendering.

Color-ID picking uses offscreen render targets to map screen pixels to object indices, while stencil-ID picking uses per-object reference values for fast, GPU-driven selection and outline highlighting.

Yes, GPU-to-CPU readback is supported using transfer buffers, allowing you to retrieve picked object data from the GPU to drive CPU-side hover or selection logic in your graphics application.

Yes, a stencil-based selection outline workflow is included to visually distinguish the picked 3D object, allowing you to highlight selected geometry directly within your existing SDL GPU render pipeline.

Yes, you can combine the color-ID and stencil-ID picking pipelines with your existing SDL GPU render setup as needed, reusing current rendering workflows while adding pixel-precise object selection.

Offscreen render targets are used for color-ID picking when you need to accurately map screen pixels to specific 3D object indices, which is essential for pixel-precise selection in interactive graphics apps.