message: Fix compositing of background color in scivis renderer
diff: @@ -63,8 +63,13 @@ void SciVis_renderSample(Renderer *uniform _self,
  }
  }
  - if (!eitherHit)
  + if (!eitherHit) {
  + vec3f color =
  + make_vec3f(outputColor) + (1.f - outputColor.w) * make_vec3f(bgColor);
  + float alpha = outputColor.w + (1.f - outputColor.w) * bgColor.w;
  + outputColor = make_vec4f(color.x, color.y, color.z, alpha);
  break;
  + }
  SSI surfaceShading;
  