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Implement basic full dome correction with projecto pointing upwards and at center

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of dome.
This commit is contained in:
Robert Osfield 2007-02-22 16:42:59 +00:00
parent df0de03798
commit 76d98c7c42
1 changed files with 44 additions and 24 deletions
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68
examples/osgdistortion/osgdistortion.cpp
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@ -283,8 +283,20 @@ void setDomeFaces(osgViewer::Viewer& viewer, osg::ArgumentParser& /*arguments*/)
viewer.assignSceneDataToCameras(); viewer.assignSceneDataToCameras();
} }
osg::Geometry* createDomeDistortionMesh(const osg::Vec3& origin, const osg::Vec3& widthVector, const osg::Vec3& heightVector, osg::ArgumentParser& arguments) osg::Geometry* createDomeDistortionMesh(const osg::Vec3& origin, const osg::Vec3& widthVector, const osg::Vec3& heightVector,
osg::ArgumentParser& arguments)
{ {
double sphere_radius = 1.0;
double collar_radius = 0.45;
osg::Vec3d center(0.0,0.0,0.0);
osg::Vec3d eye(0.0,0.0,0.0);
double distance = sqrt(sphere_radius*sphere_radius - collar_radius*collar_radius);
osg::Vec3d projector = eye - osg::Vec3d(0.0,0.0, distance);
osg::notify(osg::NOTICE)<<"Projector position = "<<projector<<std::endl;
// create the quad to visualize. // create the quad to visualize.
osg::Geometry* geometry = new osg::Geometry(); osg::Geometry* geometry = new osg::Geometry();
@ -298,7 +310,7 @@ osg::Geometry* createDomeDistortionMesh(const osg::Vec3& origin, const osg::Vec3
float height = heightVector.length(); float height = heightVector.length();
yAxis /= height; yAxis /= height;
int noSteps = 50; int noSteps = 100;
osg::Vec3Array* vertices = new osg::Vec3Array; osg::Vec3Array* vertices = new osg::Vec3Array;
osg::Vec3Array* texcoords = new osg::Vec3Array; osg::Vec3Array* texcoords = new osg::Vec3Array;
@ -307,27 +319,37 @@ osg::Geometry* createDomeDistortionMesh(const osg::Vec3& origin, const osg::Vec3
osg::Vec3 bottom = origin; osg::Vec3 bottom = origin;
osg::Vec3 dx = xAxis*(width/((float)(noSteps-1))); osg::Vec3 dx = xAxis*(width/((float)(noSteps-1)));
osg::Vec3 dy = yAxis*(height/((float)(noSteps-1))); osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
osg::Vec3 bottom_texcoord(0.0f,0.0f,0.0f); osg::Vec3d screenCenter = origin + widthVector*0.5f + heightVector*0.5f;
osg::Vec3 dx_texcoord(1.0f/(float)(noSteps-1),0.0f,0.0f); float screenRadius = heightVector.length() * 0.5f;
osg::Vec3 dy_texcoord(0.0f,1.0f/(float)(noSteps-1),0.0f);
osg::Vec3 cursor = bottom; osg::Vec3 cursor = bottom;
osg::Vec3 texcoord = bottom_texcoord;
int i,j; int i,j;
for(i=0;i<noSteps;++i) for(i=0;i<noSteps;++i)
{ {
osg::Vec3 cursor = bottom+dy*(float)i; osg::Vec3 cursor = bottom+dy*(float)i;
osg::Vec3 texcoord = bottom_texcoord+dy_texcoord*(float)i;
for(j=0;j<noSteps;++j) for(j=0;j<noSteps;++j)
{ {
osg::Vec2 delta(cursor.x() - screenCenter.x(), cursor.y() - screenCenter.y());
double theta = atan2(-delta.y(), delta.x());
double phi = osg::PI_2 * delta.length() / screenRadius;
if (phi > osg::PI_2) phi = osg::PI_2;
phi *= 2.0;
// osg::notify(osg::NOTICE)<<"theta = "<<theta<< "phi="<<phi<<std::endl;
osg::Vec3 texcoord(sin(phi) * cos(theta),
sin(phi) * sin(theta),
cos(phi));
vertices->push_back(cursor); vertices->push_back(cursor);
texcoords->push_back(osg::Vec3((sin(texcoord.x()*osg::PI-osg::PI*0.5)+1.0f)*0.5f,(1.0-sin(texcoord.y()*osg::PI-osg::PI*0.5))*0.5f,1.0));
colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f)); colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
texcoords->push_back(texcoord);
cursor += dx; cursor += dx;
texcoord += dx_texcoord;
} }
// osg::notify(osg::NOTICE)<<std::endl;
} }
// pass the created vertex array to the points geometry object. // pass the created vertex array to the points geometry object.
@ -415,7 +437,7 @@ void setDomeCorrection(osgViewer::Viewer& viewer, osg::ArgumentParser& arguments
camera->setRenderTargetImplementation(renderTargetImplementation); camera->setRenderTargetImplementation(renderTargetImplementation);
// attach the texture and use it as the color buffer. // attach the texture and use it as the color buffer.
camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, osg::TextureCubeMap::POSITIVE_Z); camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, osg::TextureCubeMap::POSITIVE_Y);
viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd()); viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd());
} }
@ -436,11 +458,7 @@ void setDomeCorrection(osgViewer::Viewer& viewer, osg::ArgumentParser& arguments
camera->setRenderTargetImplementation(renderTargetImplementation); camera->setRenderTargetImplementation(renderTargetImplementation);
// attach the texture and use it as the color buffer. // attach the texture and use it as the color buffer.
#ifdef CUBE_MAP camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, osg::TextureCubeMap::POSITIVE_Z);
camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, osg::TextureCubeMap::POSITIVE_Y);
#else
camera->attach(osg::Camera::COLOR_BUFFER, texture);
#endif
viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd::rotate(osg::inDegrees(-90.0f), 1.0,0.0,0.0)); viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd::rotate(osg::inDegrees(-90.0f), 1.0,0.0,0.0));
} }
@ -461,7 +479,7 @@ void setDomeCorrection(osgViewer::Viewer& viewer, osg::ArgumentParser& arguments
// attach the texture and use it as the color buffer. // attach the texture and use it as the color buffer.
camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, osg::TextureCubeMap::NEGATIVE_X); camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, osg::TextureCubeMap::NEGATIVE_X);
viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd::rotate(osg::inDegrees(-90.0f), 0.0,1.0,0.0)); viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd::rotate(osg::inDegrees(-90.0f), 0.0,1.0,0.0) * osg::Matrixd::rotate(osg::inDegrees(-90.0f), 0.0,0.0,1.0));
} }
// right face // right face
@ -478,9 +496,9 @@ void setDomeCorrection(osgViewer::Viewer& viewer, osg::ArgumentParser& arguments
camera->setRenderTargetImplementation(renderTargetImplementation); camera->setRenderTargetImplementation(renderTargetImplementation);
// attach the texture and use it as the color buffer. // attach the texture and use it as the color buffer.
camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, osg::TextureCubeMap::NEGATIVE_X); camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, osg::TextureCubeMap::POSITIVE_X);
viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd::rotate(osg::inDegrees(90.0f), 0.0,1.0,0.0)); viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd::rotate(osg::inDegrees(90.0f), 0.0,1.0,0.0 ) * osg::Matrixd::rotate(osg::inDegrees(90.0f), 0.0,0.0,1.0));
} }
// bottom face // bottom face
@ -497,9 +515,9 @@ void setDomeCorrection(osgViewer::Viewer& viewer, osg::ArgumentParser& arguments
camera->setRenderTargetImplementation(renderTargetImplementation); camera->setRenderTargetImplementation(renderTargetImplementation);
// attach the texture and use it as the color buffer. // attach the texture and use it as the color buffer.
camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, osg::TextureCubeMap::NEGATIVE_Y); camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, osg::TextureCubeMap::NEGATIVE_Z);
viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd::rotate(osg::inDegrees(90.0f), 1.0,0.0,0.0)); viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd::rotate(osg::inDegrees(90.0f), 1.0,0.0,0.0) * osg::Matrixd::rotate(osg::inDegrees(180.0f), 0.0,0.0,1.0));
} }
// back face // back face
@ -516,9 +534,9 @@ void setDomeCorrection(osgViewer::Viewer& viewer, osg::ArgumentParser& arguments
camera->setRenderTargetImplementation(renderTargetImplementation); camera->setRenderTargetImplementation(renderTargetImplementation);
// attach the texture and use it as the color buffer. // attach the texture and use it as the color buffer.
camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, osg::TextureCubeMap::NEGATIVE_Z); camera->attach(osg::Camera::COLOR_BUFFER, texture, 0, osg::TextureCubeMap::NEGATIVE_Y);
viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd::rotate(osg::inDegrees(-180.0f), 1.0,0.0,0.0)); viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd::rotate(osg::inDegrees(180.0f), 1.0,0.0,0.0));
} }
viewer.getCamera()->setProjectionMatrixAsPerspective(90.0f, 1.0, 1, 1000.0); viewer.getCamera()->setProjectionMatrixAsPerspective(90.0f, 1.0, 1, 1000.0);
@ -561,6 +579,8 @@ void setDomeCorrection(osgViewer::Viewer& viewer, osg::ArgumentParser& arguments
viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd()); viewer.addSlave(camera.get(), osg::Matrixd(), osg::Matrixd());
} }
viewer.getCamera()->setNearFarRatio(0.0001f);
} }