You probably know https://www.shadertoy.com/ already, but if not, prepare to have your mind blown. Many shaders there use Signed Distance Fields to draw intricate 3D geometry within the fragment shader. If you find that interesting, check out Inigo Quilez's excellent tutorial series: https://iquilezles.org/articles/raymarchingdf/
You probably know https://www.shadertoy.com/ already, but if not, prepare to have your mind blown. Many shaders there use Signed Distance Fields to draw intricate 3D geometry within the fragment shader. If you find that interesting, check out Inigo Quilez's excellent tutorial series: https://iquilezles.org/articles/raymarchingdf/