render_shapes.cpp

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/* Author: Ioan Sucan */

#include <moveit/rviz_plugin_render_tools/render_shapes.h>
#include <moveit/rviz_plugin_render_tools/octomap_render.h>
#include <geometric_shapes/mesh_operations.h>

#include <OgreSceneNode.h>
#include <OgreSceneManager.h>
#include <OgreManualObject.h>
#include <OgreMaterialManager.h>

#include <rviz/ogre_helpers/shape.h>
#include <rviz/ogre_helpers/mesh_shape.h>

#include <rviz/display_context.h>
#include <rviz/robot/robot.h>

#include <boost/lexical_cast.hpp>
#include <boost/math/constants/constants.hpp>

#include <memory>

namespace moveit_rviz_plugin
{
RenderShapes::RenderShapes(rviz::DisplayContext* context) : context_(context)
{
}

RenderShapes::~RenderShapes()
{
  clear();
}

void RenderShapes::clear()
{
  scene_shapes_.clear();
  octree_voxel_grids_.clear();
}

void RenderShapes::renderShape(Ogre::SceneNode* node, const shapes::Shape* s, const Eigen::Affine3d& p,
                               OctreeVoxelRenderMode octree_voxel_rendering, OctreeVoxelColorMode octree_color_mode,
                               const rviz::Color& color, float alpha)
{
  rviz::Shape* ogre_shape = NULL;
  Eigen::Vector3d translation = p.translation();
  Ogre::Vector3 position(translation.x(), translation.y(), translation.z());
  Eigen::Quaterniond q(p.linear());
  Ogre::Quaternion orientation(q.w(), q.x(), q.y(), q.z());

  // we don't know how to render cones directly, but we can convert them to a mesh
  if (s->type == shapes::CONE)
  {
    std::unique_ptr<shapes::Mesh> m(shapes::createMeshFromShape(static_cast<const shapes::Cone&>(*s)));
    if (m)
      renderShape(node, m.get(), p, octree_voxel_rendering, octree_color_mode, color, alpha);
    return;
  }

  switch (s->type)
  {
    case shapes::SPHERE:
    {
      ogre_shape = new rviz::Shape(rviz::Shape::Sphere, context_->getSceneManager(), node);
      double d = 2.0 * static_cast<const shapes::Sphere*>(s)->radius;
      ogre_shape->setScale(Ogre::Vector3(d, d, d));
    }
    break;
    case shapes::BOX:
    {
      ogre_shape = new rviz::Shape(rviz::Shape::Cube, context_->getSceneManager(), node);
      const double* sz = static_cast<const shapes::Box*>(s)->size;
      ogre_shape->setScale(Ogre::Vector3(sz[0], sz[1], sz[2]));
    }
    break;
    case shapes::CYLINDER:
    {
      ogre_shape = new rviz::Shape(rviz::Shape::Cylinder, context_->getSceneManager(), node);
      double d = 2.0 * static_cast<const shapes::Cylinder*>(s)->radius;
      double z = static_cast<const shapes::Cylinder*>(s)->length;
      ogre_shape->setScale(Ogre::Vector3(d, z, d));  // the shape has z as major axis, but the rendered cylinder has y
                                                     // as major axis (assuming z is upright);
    }
    break;
    case shapes::MESH:
    {
      const shapes::Mesh* mesh = static_cast<const shapes::Mesh*>(s);
      if (mesh->triangle_count > 0)
      {
        rviz::MeshShape* m = new rviz::MeshShape(context_->getSceneManager(), node);
        ogre_shape = m;

        Ogre::Vector3 normal(0.0, 0.0, 0.0);
        for (unsigned int i = 0; i < mesh->triangle_count; ++i)
        {
          unsigned int i3 = i * 3;
          if (mesh->triangle_normals && !mesh->vertex_normals)
          {
            normal.x = mesh->triangle_normals[i3];
            normal.y = mesh->triangle_normals[i3 + 1];
            normal.z = mesh->triangle_normals[i3 + 2];
          }

          for (int k = 0; k < 3; ++k)
          {
            unsigned int vi = 3 * mesh->triangles[i3 + k];
            Ogre::Vector3 v(mesh->vertices[vi], mesh->vertices[vi + 1], mesh->vertices[vi + 2]);
            if (mesh->vertex_normals)
            {
              Ogre::Vector3 n(mesh->vertex_normals[vi], mesh->vertex_normals[vi + 1], mesh->vertex_normals[vi + 2]);
              m->addVertex(v, n);
            }
            else if (mesh->triangle_normals)
              m->addVertex(v, normal);
            else
              m->addVertex(v);
          }
        }
        m->endTriangles();
      }
    }
    break;

    case shapes::OCTREE:
    {
      OcTreeRenderPtr octree(new OcTreeRender(static_cast<const shapes::OcTree*>(s)->octree, octree_voxel_rendering,
                                              octree_color_mode, 0u, context_->getSceneManager(), node));
      octree->setPosition(position);
      octree->setOrientation(orientation);
      octree_voxel_grids_.push_back(octree);
    }
    break;

    default:
      break;
  }

  if (ogre_shape)
  {
    ogre_shape->setColor(color.r_, color.g_, color.b_, alpha);

    if (s->type == shapes::CYLINDER)
    {
      // in geometric shapes, the z axis of the cylinder is its height;
      // for the rviz shape, the y axis is the height; we add a transform to fix this
      static Ogre::Quaternion fix(Ogre::Radian(boost::math::constants::pi<double>() / 2.0),
                                  Ogre::Vector3(1.0, 0.0, 0.0));
      orientation = orientation * fix;
    }

    ogre_shape->setPosition(position);
    ogre_shape->setOrientation(orientation);
    scene_shapes_.emplace_back(ogre_shape);
  }
}
}