forge-edge-detection

You can add edge detection and X-ray vision to SDL GPU pipelines by using a G-buffer MRT for depth and normals, applying Sobel filtering for edges, and using depth_fail_op stencil updates to reveal occluded geometry.

Sobel edge detection on a G-buffer processes depth and view-space normals to reveal geometry boundaries in real-time rendering. This highlights object outlines and provides clear visual feedback for structural edges.

Yes, you can render Fresnel ghost silhouettes in SDL by applying additive blending to silhouette edges. This emphasizes hidden geometry by additively combining ghost outlines with your existing scene rendering.

Yes, you need two MRT targets for color and normals plus a depth-stencil buffer. The stencil-based X-ray vision uses depth_fail_op operations on this buffer to mark and selectively reveal occluded objects.

Depth_fail_op stencil updates mark occluded objects by modifying stencil values where depth tests fail. This allows selective visibility rendering, making hidden geometry visible as an X-ray silhouette effect.

The best way to reveal hidden geometry in SDL is combining Sobel edge detection on view-space normals with stencil-based X-ray vision. This approach highlights both visible boundaries and occluded structural edges.