Transparency in PoTriangleMesh2D

[lisamcgregor]

I am trying to make a PoTriangleMesh2D transparent - but it doesn't seem to be working.

[INDENT]PoTriangleMesh2D* mesh = new PoTriangleMesh2D;
mesh->setGeometry(surface.points_.size(), x, y);

// add a set of scalar values to this mesh
if (zmin != zmax)
mesh->addValuesSet(0, z);

SbColor colors[5] = {SbColor(1.0,0.0,0.0), SbColor(1.0,1.0,0.0), SbColor(0.0,1.,0.), SbColor(0.0,1.0,1.0),
SbColor(0.0,0.0,1.0)};

float val[5];
val[0] = zmin; for (int j = 1; j < 5; j++) val[j] = val[j - 1] + (zmax - zmin) / 4;
PoNonLinearDataMapping2* dataMapping = new PoNonLinearDataMapping2;
dataMapping->value.setValues(0, 5, val);
dataMapping->color.setValues(0, 5, colors);
dataMapping->type = PoNonLinearDataMapping2::LINEAR_PER_LEVEL;
dataMapping->transparencyEnabled = true;
dataMapping->transparency = 0.2;

// define the mesh surface
PoMeshFilled* meshFilled = new PoMeshFilled;
meshFilled->valuesIndex.setValue(0);
meshFilled->coloringType = PoMesh::COLOR_MAPPING;
meshFilled->zValuesIndex = 0;[/INDENT]

I am using OIV toolkit 9.8. Is it possible to obtain transparency of the mesh in this way?

[mikeheck]

I am trying to make a PoTriangleMesh2D transparent - but it doesn't seem to be working.

dataMapping->transparency = 0.2;

I am using OIV toolkit 9.8. Is it possible to obtain transparency of the mesh in this way?

Yes, that's definitely possible. There is just a small mistake in your code. Note the second sentence in the method description:

SoMFFloatPoNonLinearDataMapping2::transparency

Defines the list of transparencies for the data mapping.
To be taken into account the number of transparencies must be equal to the number of colors, otherwise transparencies are ignored.

Also, since this could be a complex surface, don't forget to request high quality transparency:

viewer->setTransparencyType(SoGLRenderAction::TransparencyType::SORTED_LAYERS_BLEND);

Regards,
Mike