Hi Sam,
On a quick read of your code I can't see a problem. Does this work OK?
It's perfectly find to just use DrawArrays without indices like you
have done. You can mix both DrawArrays and DrawElementsUShort in a
single osg::Geometry as well.
I'm not clear on what issue you are having.
Cheers,
Robert.
On Thu, 14 Jun 2018 at 09:24, Sam Brkopac <brko...@gmail.com> wrote:
>
> Hi Robert,
>
> I have the mesh setup correctly using the DrawElementsUShort. My question was
> regarding drawing the walkable triangles that are attached to the mesh. These
> don't have indices and just consist of the vertex information. Here was my
> approach to draw them.
>
>
> Code:
>
> for (size_t index = 0; index < sno.mystery_section_count(); index++)
> {
> const auto * mystery_section = sno.mystery()->at(index);
>
> const auto triangleSectionCount =
> mystery_section->triangle_section_count();
>
> osg::ref_ptr<osg::Geode> flags = new osg::Geode;
> grouping->addChild(flags);
>
> const osg::Vec4 non(1.0f, 0.0f, 0.0f, 0.5f); // red for non-walkable
> const osg::Vec4 floor(0.0f, 1.0f, 0.0f, 0.5f); // green for walkable
> const osg::Vec4 water(0.0f, 0.0f, 1.0f, 0.5f); // blue for water
>
> osg::ref_ptr<osg::Vec4Array> color(new osg::Vec4Array(1));
>
> switch (mystery_section->floor())
> {
> case sno_t::floor_t::FLOOR_IGNORED:
> (*color)[0] = non;
> break;
> case sno_t::floor_t::FLOOR_FLOOR:
> (*color)[0] = floor;
> break;
> case sno_t::floor_t::FLOOR_WATER:
> (*color)[0] = water;
> break;
> }
>
> for (size_t j = 0; j < triangleSectionCount; j++)
> {
> const auto * triangle_section =
> mystery_section->triangle_section()->at(j);
>
> const auto * triangleA = triangle_section->triangle()->a();
> const auto * triangleB = triangle_section->triangle()->b();
> const auto * triangleC = triangle_section->triangle()->c();
>
> // setup the vertices based on the triangles
> osg::ref_ptr<osg::Vec3Array> vertices(new osg::Vec3Array(3));
> (*vertices)[0] = osg::Vec3(triangleA->x(), triangleA->y(),
> triangleA->z());
> (*vertices)[1] = osg::Vec3(triangleB->x(), triangleB->y(),
> triangleB->z());
> (*vertices)[2] = osg::Vec3(triangleC->x(), triangleC->y(),
> triangleC->z());
>
> // setup our geometry
> osg::ref_ptr<osg::Geometry> geometry(new osg::Geometry);
> geometry->setVertexArray(vertices);
> geometry->setColorArray(color);
> geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
> geometry->addPrimitiveSet(new osg::DrawArrays(GL_TRIANGLES, 0, 3));
>
> osg::ref_ptr<osg::Geode> geode(new osg::Geode);
> geode->addDrawable(geometry);
> geode->getOrCreateStateSet()->setMode(GL_LIGHTING,
> osg::StateAttribute::OFF);
> geode->getOrCreateStateSet()->setMode(GL_BLEND,
> osg::StateAttribute::ON);
>
> geode->getOrCreateStateSet()->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
>
> // prevent z-fighting.
> osg::ref_ptr<osg::PolygonOffset> polyOffset = new osg::PolygonOffset;
> polyOffset->setFactor(-1.0f);
> polyOffset->setUnits(-1.0f);
>
> osg::ref_ptr<osg::PolygonMode> polyMode = new osg::PolygonMode;
> polyMode->setMode(osg::PolygonMode::FRONT_AND_BACK,
> osg::PolygonMode::FILL);
> geode->getOrCreateStateSet()->setAttributeAndModes(polyOffset,
> osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON);
> geode->getOrCreateStateSet()->setAttributeAndModes(polyMode,
> osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON);
>
> flags->addChild(geode);
> }
> }
>
>
>
>
> If you have any feedback on the methodology, I'd love to hear it.
>
> Thanks,
> Sam[/code]
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=74070#74070
>
>
>
>
>
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