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OpenSceneGraph/src/osgPlugins/vrml/Primitives.cpp

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From Gino van den Bergen, "I've refactored the single ReadedWriterVRML2.cpp into multiple files. The reason for doing this was to break up the horribly long function osg::ref_ptr<osg::Node> ReaderWriterVRML2::convertFromVRML(openvrml::node *obj) The fixes are: * Added the source's parent directory as search directory for image files. * The material properties are now set in the stateset of the Geode rather than the Geometry. This will allow geometries to be reused with different material properties in future updates. NB: I planned for a caching scheme in which multiple occurences of the same primitive (e.g., Cylinders with radius 0.8 and height 1.2), would use the same Geometry object. Unfortunately, my planning moved me to other areas, but I might still finish the caching scheme in a quiet hour. For the time being I decided it would be a good thing to already submit my current changes. "
2008-05-27 20:06:50 +08:00
// -*-c++-*-
#include "ReaderWriterVRML2.h"
#include <complex>
#if defined(_MSC_VER)
# pragma warning(disable: 4250)
# pragma warning(disable: 4290)
# pragma warning(disable: 4800)
#endif
#include <openvrml/vrml97node.h>
#include <openvrml/common.h>
#include <openvrml/node.h>
#include <openvrml/node_ptr.h>
#include <openvrml/field.h>
#include <osg/CullFace>
osg::ref_ptr<osg::Geometry> ReaderWriterVRML2::convertVRML97Box(openvrml::vrml97_node::box_node* vrml_box)
{
osg::ref_ptr<osg::Geometry> osg_geom = new osg::Geometry();
const openvrml::vec3f& size = static_cast<const openvrml::sfvec3f&>(vrml_box->field("size")).value;
osg::Vec3 halfSize(size[0] * 0.5f, size[1] * 0.5f, size[2] * 0.5f);
osg::ref_ptr<osg::Vec3Array> osg_vertices = new osg::Vec3Array();
osg::ref_ptr<osg::Vec2Array> osg_texcoords = new osg::Vec2Array();
osg::ref_ptr<osg::Vec3Array> osg_normals = new osg::Vec3Array();
osg::ref_ptr<osg::DrawArrays> box = new osg::DrawArrays(osg::PrimitiveSet::QUADS);
osg_vertices->push_back(osg::Vec3(-halfSize[0], halfSize[1], halfSize[2]));
osg_vertices->push_back(osg::Vec3(-halfSize[0], -halfSize[1], halfSize[2]));
osg_vertices->push_back(osg::Vec3(halfSize[0], -halfSize[1], halfSize[2]));
osg_vertices->push_back(osg::Vec3(halfSize[0], halfSize[1], halfSize[2]));
osg_vertices->push_back(osg::Vec3(halfSize[0], halfSize[1], -halfSize[2]));
osg_vertices->push_back(osg::Vec3(halfSize[0], -halfSize[1], -halfSize[2]));
osg_vertices->push_back(osg::Vec3(-halfSize[0], -halfSize[1], -halfSize[2]));
osg_vertices->push_back(osg::Vec3(-halfSize[0], halfSize[1], -halfSize[2]));
osg_vertices->push_back(osg::Vec3(halfSize[0], halfSize[1], halfSize[2]));
osg_vertices->push_back(osg::Vec3(halfSize[0], -halfSize[1], halfSize[2]));
osg_vertices->push_back(osg::Vec3(halfSize[0], -halfSize[1], -halfSize[2]));
osg_vertices->push_back(osg::Vec3(halfSize[0], halfSize[1], -halfSize[2]));
osg_vertices->push_back(osg::Vec3(-halfSize[0], halfSize[1], -halfSize[2]));
osg_vertices->push_back(osg::Vec3(-halfSize[0], -halfSize[1], -halfSize[2]));
osg_vertices->push_back(osg::Vec3(-halfSize[0], -halfSize[1], halfSize[2]));
osg_vertices->push_back(osg::Vec3(-halfSize[0], halfSize[1], halfSize[2]));
osg_vertices->push_back(osg::Vec3(-halfSize[0], halfSize[1], -halfSize[2]));
osg_vertices->push_back(osg::Vec3(-halfSize[0], halfSize[1], halfSize[2]));
osg_vertices->push_back(osg::Vec3(halfSize[0], halfSize[1], halfSize[2]));
osg_vertices->push_back(osg::Vec3(halfSize[0], halfSize[1], -halfSize[2]));
osg_vertices->push_back(osg::Vec3(-halfSize[0], -halfSize[1], halfSize[2]));
osg_vertices->push_back(osg::Vec3(-halfSize[0], -halfSize[1], -halfSize[2]));
osg_vertices->push_back(osg::Vec3(halfSize[0], -halfSize[1], -halfSize[2]));
osg_vertices->push_back(osg::Vec3(halfSize[0], -halfSize[1], halfSize[2]));
for (int i = 0; i != 6; ++i)
{
osg_texcoords->push_back(osg::Vec2(0.0f, 1.0f));
osg_texcoords->push_back(osg::Vec2(0.0f, 0.0f));
osg_texcoords->push_back(osg::Vec2(1.0f, 0.0f));
osg_texcoords->push_back(osg::Vec2(1.0f, 1.0f));
}
osg_normals->push_back(osg::Vec3(0.0f, 0.0f, 1.0f));
osg_normals->push_back(osg::Vec3(0.0f, 0.0f, -1.0f));
osg_normals->push_back(osg::Vec3(1.0f, 0.0f, 0.0f));
osg_normals->push_back(osg::Vec3(-1.0f, 0.0f, 0.0f));
osg_normals->push_back(osg::Vec3(0.0f, 1.0f, 0.0f));
osg_normals->push_back(osg::Vec3(0.0f, -1.0f, 0.0f));
box->setCount(osg_vertices->size());
osg_geom->addPrimitiveSet(box.get());
osg_geom->setVertexArray(osg_vertices.get());
osg_geom->setTexCoordArray(0, osg_texcoords.get());
osg_geom->setNormalArray(osg_normals.get());
osg_geom->setNormalBinding(osg::Geometry::BIND_PER_PRIMITIVE);
osg_geom->getOrCreateStateSet()->setAttributeAndModes(new osg::CullFace(osg::CullFace::BACK));
return osg_geom.get();
}
osg::ref_ptr<osg::Geometry> ReaderWriterVRML2::convertVRML97Sphere(openvrml::vrml97_node::sphere_node* vrml_sphere)
{
osg::ref_ptr<osg::Geometry> osg_geom = new osg::Geometry();
float radius = static_cast<const openvrml::sffloat&>(vrml_sphere->field("radius")).value;
osg::ref_ptr<osg::Vec3Array> osg_vertices = new osg::Vec3Array();
osg::ref_ptr<osg::Vec2Array> osg_texcoords = new osg::Vec2Array();
osg::ref_ptr<osg::Vec3Array> osg_normals = new osg::Vec3Array();
unsigned int numSegments = 40;
unsigned int numRows = 20;
const float thetaDelta = 2.0f * float(osg::PI) / float(numSegments);
const float texCoordSDelta = 1.0f / float(numSegments);
const float phiDelta = float(osg::PI) / float(numRows);
const float texCoordTDelta = 1.0f / float(numRows);
float phi = -0.5f * float(osg::PI);
float texCoordT = 0.0f;
osg::ref_ptr<osg::DrawArrayLengths> sphere = new osg::DrawArrayLengths(osg::PrimitiveSet::QUAD_STRIP);
for (unsigned int i = 0; i < numRows; ++i, phi += phiDelta, texCoordT += texCoordTDelta)
{
std::complex<float> latBottom = std::polar(1.0f, phi);
std::complex<float> latTop = std::polar(1.0f, phi + phiDelta);
std::complex<float> eBottom = latBottom * radius;
std::complex<float> eTop = latTop * radius;
float theta = 0.0f;
float texCoordS = 0.0f;
for (unsigned int j = 0; j < numSegments; ++j, theta += thetaDelta, texCoordS += texCoordSDelta)
{
std::complex<float> n = -std::polar(1.0f, theta);
osg_normals->push_back(osg::Vec3(latTop.real() * n.imag(), latTop.imag(), latTop.real() * n.real()));
osg_normals->push_back(osg::Vec3(latBottom.real() * n.imag(), latBottom.imag(), latBottom.real() * n.real()));
osg_texcoords->push_back(osg::Vec2(texCoordS, texCoordT + texCoordTDelta));
osg_texcoords->push_back(osg::Vec2(texCoordS, texCoordT));
osg_vertices->push_back(osg::Vec3(eTop.real() * n.imag(), eTop.imag(), eTop.real() * n.real()));
osg_vertices->push_back(osg::Vec3(eBottom.real() * n.imag(), eBottom.imag(), eBottom.real() * n.real()));
}
osg_normals->push_back(osg::Vec3(0.0f, latTop.imag(), -latTop.real()));
osg_normals->push_back(osg::Vec3(0.0f, latBottom.imag(), -latBottom.real()));
osg_texcoords->push_back(osg::Vec2(1.0f, texCoordT + texCoordTDelta));
osg_texcoords->push_back(osg::Vec2(1.0f, texCoordT));
osg_vertices->push_back(osg::Vec3(0.0f, eTop.imag(), -eTop.real()));
osg_vertices->push_back(osg::Vec3(0.0f, eBottom.imag(), -eBottom.real()));
sphere->push_back(numSegments * 2 + 2);
}
osg_geom->addPrimitiveSet(sphere.get());
osg_geom->setVertexArray(osg_vertices.get());
osg_geom->setTexCoordArray(0, osg_texcoords.get());
osg_geom->setNormalArray(osg_normals.get());
osg_geom->setNormalBinding(osg::Geometry::BIND_PER_VERTEX);
osg_geom->getOrCreateStateSet()->setAttributeAndModes(new osg::CullFace(osg::CullFace::BACK));
return osg_geom.get();
}
osg::ref_ptr<osg::Geometry> ReaderWriterVRML2::convertVRML97Cone(openvrml::vrml97_node::cone_node* vrml_cone)
{
osg::ref_ptr<osg::Geometry> osg_geom = new osg::Geometry();
float height = static_cast<const openvrml::sffloat&>(vrml_cone->field("height")).value;
float radius = static_cast<const openvrml::sffloat&>(vrml_cone->field("bottomRadius")).value;
osg::ref_ptr<osg::Vec3Array> osg_vertices = new osg::Vec3Array();
osg::ref_ptr<osg::Vec2Array> osg_texcoords = new osg::Vec2Array();
osg::ref_ptr<osg::Vec3Array> osg_normals = new osg::Vec3Array();
unsigned int numSegments = 40;
const float thetaDelta = 2.0f * float(osg::PI) / float(numSegments);
float topY = height * 0.5f;
float bottomY = height * -0.5f;
if (static_cast<const openvrml::sfbool&>(vrml_cone->field("side")).value)
{
osg::ref_ptr<osg::DrawArrays> side = new osg::DrawArrays(osg::PrimitiveSet::QUAD_STRIP);
const float texCoordDelta = 1.0f / float(numSegments);
float theta = 0.0f;
float texCoord = 0.0f;
for (unsigned int i = 0; i < numSegments; ++i, theta += thetaDelta, texCoord += texCoordDelta)
{
std::complex<float> n = -std::polar(1.0f, theta);
std::complex<float> e = n * radius;
osg::Vec3 normal(n.imag() * height, radius, n.real() * height);
normal.normalize();
osg_normals->push_back(normal);
osg_normals->push_back(normal);
osg_texcoords->push_back(osg::Vec2(texCoord, 1.0f));
osg_texcoords->push_back(osg::Vec2(texCoord, 0.0f));
osg_vertices->push_back(osg::Vec3(0.0f, topY, 0.0f));
osg_vertices->push_back(osg::Vec3(e.imag(), bottomY, e.real()));
}
// do last point by hand to ensure no round off errors.
osg::Vec3 normal(0.0f, radius, -height);
normal.normalize();
osg_normals->push_back(normal);
osg_normals->push_back(normal);
osg_texcoords->push_back(osg::Vec2(1.0f, 1.0f));
osg_texcoords->push_back(osg::Vec2(1.0f, 0.0f));
osg_vertices->push_back(osg::Vec3(0.0f, topY, 0.0f));
osg_vertices->push_back(osg::Vec3(0.0f, bottomY, -radius));
side->setCount(osg_vertices->size());
osg_geom->addPrimitiveSet(side.get());
}
if (static_cast<const openvrml::sfbool&>(vrml_cone->field("bottom")).value)
{
osg::ref_ptr<osg::DrawArrays> bottom = new osg::DrawArrays(osg::PrimitiveSet::TRIANGLE_FAN);
size_t first = osg_vertices->size();
bottom->setFirst(first);
float theta = 0.0f;
for (unsigned int i = 0; i < numSegments; ++i, theta += thetaDelta)
{
std::complex<float> n = -std::polar(1.0f, theta);
std::complex<float> e = n * radius;
osg_normals->push_back(osg::Vec3(0.0f, -1.0f, 0.0f));
osg_texcoords->push_back(osg::Vec2(0.5f - 0.5f * n.imag(), 0.5f + 0.5f * n.real()));
osg_vertices->push_back(osg::Vec3(-e.imag(), bottomY, e.real()));
}
// do last point by hand to ensure no round off errors.
osg_normals->push_back(osg::Vec3(0.0f, -1.0f, 0.0f));
osg_texcoords->push_back(osg::Vec2(0.5f, 0.0f));
osg_vertices->push_back(osg::Vec3(0.0f, bottomY, -radius));
bottom->setCount(osg_vertices->size() - first);
osg_geom->addPrimitiveSet(bottom.get());
}
osg_geom->setVertexArray(osg_vertices.get());
osg_geom->setTexCoordArray(0, osg_texcoords.get());
osg_geom->setNormalArray(osg_normals.get());
osg_geom->setNormalBinding(osg::Geometry::BIND_PER_VERTEX);
osg_geom->getOrCreateStateSet()->setAttributeAndModes(new osg::CullFace(osg::CullFace::BACK));
return osg_geom.get();
}
osg::ref_ptr<osg::Geometry> ReaderWriterVRML2::convertVRML97Cylinder(openvrml::vrml97_node::cylinder_node* vrml_cylinder)
{
osg::ref_ptr<osg::Geometry> osg_geom = new osg::Geometry();
float height = static_cast<const openvrml::sffloat&>(vrml_cylinder->field("height")).value;
float radius = static_cast<const openvrml::sffloat&>(vrml_cylinder->field("radius")).value;
osg::ref_ptr<osg::Vec3Array> osg_vertices = new osg::Vec3Array();
osg::ref_ptr<osg::Vec2Array> osg_texcoords = new osg::Vec2Array();
osg::ref_ptr<osg::Vec3Array> osg_normals = new osg::Vec3Array();
unsigned int numSegments = 40;
const float thetaDelta = 2.0f * float(osg::PI) / float(numSegments);
float topY = height * 0.5f;
float bottomY = height * -0.5f;
if (static_cast<const openvrml::sfbool&>(vrml_cylinder->field("side")).value)
{
osg::ref_ptr<osg::DrawArrays> side = new osg::DrawArrays(osg::PrimitiveSet::QUAD_STRIP);
const float texCoordDelta = 1.0f / float(numSegments);
float theta = 0.0f;
float texCoord = 0.0f;
for (unsigned int i = 0; i < numSegments; ++i, theta += thetaDelta, texCoord += texCoordDelta)
{
std::complex<float> n = -std::polar(1.0f, theta);
std::complex<float> e = n * radius;
osg::Vec3 normal(n.imag(), 0.0f, n.real());
osg_normals->push_back(normal);
osg_normals->push_back(normal);
osg_texcoords->push_back(osg::Vec2(texCoord, 1.0f));
osg_texcoords->push_back(osg::Vec2(texCoord, 0.0f));
osg_vertices->push_back(osg::Vec3(e.imag(), topY, e.real()));
osg_vertices->push_back(osg::Vec3(e.imag(), bottomY, e.real()));
}
// do last point by hand to ensure no round off errors.
osg::Vec3 normal(0.0f, 0.0f, -1.0f);
osg_normals->push_back(normal);
osg_normals->push_back(normal);
osg_texcoords->push_back(osg::Vec2(1.0f, 1.0f));
osg_texcoords->push_back(osg::Vec2(1.0f, 0.0f));
osg_vertices->push_back(osg::Vec3(0.0f, topY, -radius));
osg_vertices->push_back(osg::Vec3(0.0f, bottomY, -radius));
side->setCount(osg_vertices->size());
osg_geom->addPrimitiveSet(side.get());
}
if (static_cast<const openvrml::sfbool&>(vrml_cylinder->field("bottom")).value)
{
osg::ref_ptr<osg::DrawArrays> bottom = new osg::DrawArrays(osg::PrimitiveSet::TRIANGLE_FAN);
size_t first = osg_vertices->size();
bottom->setFirst(first);
float theta = 0.0f;
for (unsigned int i = 0; i < numSegments; ++i, theta += thetaDelta)
{
std::complex<float> n = -std::polar(1.0f, theta);
std::complex<float> e = n * radius;
osg_normals->push_back(osg::Vec3(0.0f, -1.0f, 0.0f));
osg_texcoords->push_back(osg::Vec2(0.5f - 0.5f * n.imag(), 0.5f + 0.5f * n.real()));
osg_vertices->push_back(osg::Vec3(-e.imag(), bottomY, e.real()));
}
// do last point by hand to ensure no round off errors.
osg_normals->push_back(osg::Vec3(0.0f, -1.0f, 0.0f));
osg_texcoords->push_back(osg::Vec2(0.5f, 0.0f));
osg_vertices->push_back(osg::Vec3(0.0f, bottomY, -radius));
bottom->setCount(osg_vertices->size() - first);
osg_geom->addPrimitiveSet(bottom.get());
}
if (static_cast<const openvrml::sfbool&>(vrml_cylinder->field("top")).value)
{
osg::ref_ptr<osg::DrawArrays> top = new osg::DrawArrays(osg::PrimitiveSet::TRIANGLE_FAN);
size_t first = osg_vertices->size();
top->setFirst(first);
float theta = 0.0f;
for (unsigned int i = 0; i < numSegments; ++i, theta += thetaDelta)
{
std::complex<float> n = -std::polar(1.0f, theta);
std::complex<float> e = n * radius;
osg_normals->push_back(osg::Vec3(0.0f, 1.0f, 0.0f));
osg_texcoords->push_back(osg::Vec2(0.5f + 0.5f * n.imag(), 0.5f - 0.5f * n.real()));
osg_vertices->push_back(osg::Vec3(e.imag(), topY, e.real()));
}
// do last point by hand to ensure no round off errors.
osg_normals->push_back(osg::Vec3(0.0f, 1.0f, 0.0f));
osg_texcoords->push_back(osg::Vec2(0.5f, 1.0f));
osg_vertices->push_back(osg::Vec3(0.0f, topY, -radius));
top->setCount(osg_vertices->size() - first);
osg_geom->addPrimitiveSet(top.get());
}
osg_geom->setVertexArray(osg_vertices.get());
osg_geom->setTexCoordArray(0, osg_texcoords.get());
osg_geom->setNormalArray(osg_normals.get());
osg_geom->setNormalBinding(osg::Geometry::BIND_PER_VERTEX);
osg_geom->getOrCreateStateSet()->setAttributeAndModes(new osg::CullFace(osg::CullFace::BACK));
return osg_geom.get();
}
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