message: simplify default opacities to just [0,1]
diff: @@ -84,9 +84,6 @@ void TransferFunctionWidget::LoadDefaultMap()
  colors.emplace_back(1.0f, 1.f, 0.f, 0.f);
  opacities.emplace_back(0.00f, 0.00f);
  - opacities.emplace_back(0.25f, 0.25f);
  - opacities.emplace_back(0.50f, 0.50f);
  - opacities.emplace_back(0.75f, 0.75f);
  opacities.emplace_back(1.00f, 1.00f);
  tfn_c_list.push_back(colors);
  @@ -96,7 +93,6 @@ void TransferFunctionWidget::LoadDefaultMap()
  tfn_names.push_back("Jet");
  colors.clear();
  - opacities.clear();
  // Ice Fire //
  @@ -121,28 +117,6 @@ void TransferFunctionWidget::LoadDefaultMap()
  colors.emplace_back(1.f, 0.0157473, 0.00332647 , 0 );
  - spacing = 1.f / 17;
  -
  - opacities.emplace_back(0 * spacing, 0 * spacing);
  - opacities.emplace_back(1 * spacing, 1 * spacing);
  - opacities.emplace_back(2 * spacing, 2 * spacing);
  - opacities.emplace_back(3 * spacing, 3 * spacing);
  - opacities.emplace_back(4 * spacing, 4 * spacing);
  - opacities.emplace_back(5 * spacing, 5 * spacing);
  - opacities.emplace_back(6 * spacing, 6 * spacing);
  - opacities.emplace_back(7 * spacing, 7 * spacing);
  - opacities.emplace_back(8 * spacing, 8 * spacing);
  - opacities.emplace_back(9 * spacing, 9 * spacing);
  - opacities.emplace_back(10 * spacing, 10 * spacing);
  - opacities.emplace_back(11 * spacing, 11 * spacing);
  - opacities.emplace_back(12 * spacing, 12 * spacing);
  - opacities.emplace_back(13 * spacing, 13 * spacing);
  - opacities.emplace_back(14 * spacing, 14 * spacing);
  - opacities.emplace_back(15 * spacing, 15 * spacing);
  - opacities.emplace_back(16 * spacing, 16 * spacing);
  -
  - opacities.emplace_back(1.f, 1.f);
  -
  tfn_c_list.push_back(colors);
  tfn_o_list.push_back(opacities);
  