message: minor fixes streamline builder
diff: #include "ospray_testing.h"
  // stl
  #include <random>
  -using namespace std;
  using namespace ospcommon::math;
  namespace ospray {
  @@ -32,9 +31,6 @@ namespace ospray {
  void commit() override;
  cpp::Group buildGroup() const override;
  -
  - private:
  - bool smooth{false};
  };
  // Inlined definitions ////////////////////////////////////////////////////
  @@ -72,7 +68,7 @@ namespace ospray {
  float f = freqDist(rng);
  float r = (720 - dEnd) / 360.f;
  - vec3f c(r, 1 - r, 1 - r / 2);
  + vec4f c(r, 1 - r, 1 - r / 2, 1.f);
  // spiral up with changing radius of curvature
  for (int d = dStart; d < dStart + dEnd; d += 10, h += hStep) {
  @@ -96,8 +92,8 @@ namespace ospray {
  points.push_back(vec4f(p, startRadius));
  points.push_back(vec4f(q, endRadius));
  indices.push_back(points.size() - 4);
  - colors.push_back(vec4f(c, 1.f));
  - colors.push_back(vec4f(c, 1.f));
  + colors.push_back(c);
  + colors.push_back(c);
  } else if (d +10 < dStart + dEnd && d + 20 > dStart + dEnd) {
  const vec3f rim = lerp(1.f + startRadius / length(p - q), p, q);
  const vec3f cap = lerp(1.f + endRadius / length(rim - q), q, rim);
  @@ -109,13 +105,13 @@ namespace ospray {
  indices.push_back(points.size() - 6);
  indices.push_back(points.size() - 5);
  indices.push_back(points.size() - 4);
  - colors.push_back(vec4f(c, 1.f));
  - colors.push_back(vec4f(c, 1.f));
  + colors.push_back(c);
  + colors.push_back(c);
  } else if ((d != dStart && d != dStart + 10) && d + 20 < dStart + dEnd ){
  points.push_back(vec4f(p, startRadius));
  indices.push_back(points.size() - 4);
  }
  - colors.push_back(vec4f(c, 1.f));
  + colors.push_back(c);
  radius -= 0.05f;
  }
  }
  