New answers tagged tessellation
Quad tessellation is similar to trianlges. The difference is that instead of barycentric coordinates gl_TessCoord.xyz which define point on a triangle (tcPosition) you have 2-component coordinate gl_TessCoord.xy (they also span in [0-1] range). Hull shader (or Tessellation Control Shader in OpenGL terminology) looks pretty straightforward: #version 430 ...
Top 50 recent answers are included