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Added ability to specify the visible region so that the example framework can support different volume sizes.

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This commit is contained in:
David Williams 2014-05-23 14:32:46 +02:00
parent ab741583e4
commit 4cec89de38
3 changed files with 19 additions and 6 deletions
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19
examples/Basic/OpenGLWidget.cpp
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@ -9,8 +9,7 @@ using namespace std;
OpenGLWidget::OpenGLWidget(QWidget *parent) OpenGLWidget::OpenGLWidget(QWidget *parent)
:QGLWidget(parent) :QGLWidget(parent)
,mCenterPoint(32,32,32) ,m_viewableRegion(Region(0, 0, 0, 255, 255, 255))
,mDistFromCenter(50)
,m_xRotation(0) ,m_xRotation(0)
,m_yRotation(0) ,m_yRotation(0)
{ {
@ -51,6 +50,12 @@ void OpenGLWidget::setSurfaceMeshToRender(const PolyVox::SurfaceMesh<CubicVertex
mMeshData.push_back(meshData); mMeshData.push_back(meshData);
} }
void OpenGLWidget::setViewableRegion(Region viewableRegion)
{
m_viewableRegion = viewableRegion;
setupWorldToCameraMatrix();
}
void OpenGLWidget::initializeGL() void OpenGLWidget::initializeGL()
{ {
GLenum err = glewInit(); GLenum err = glewInit();
@ -209,11 +214,17 @@ void OpenGLWidget::setupWorldToCameraMatrix()
{ {
shader.bind(); shader.bind();
QVector3D lowerCorner(m_viewableRegion.getLowerX(), m_viewableRegion.getLowerY(), m_viewableRegion.getLowerZ());
QVector3D upperCorner(m_viewableRegion.getUpperX(), m_viewableRegion.getUpperY(), m_viewableRegion.getUpperZ());
QVector3D centerPoint = (lowerCorner + upperCorner) * 0.5;
float fDiagonalLength = (upperCorner - lowerCorner).length();
QMatrix4x4 worldToCameraMatrix{}; QMatrix4x4 worldToCameraMatrix{};
worldToCameraMatrix.translate(0, 0, -mDistFromCenter); //Move the camera back by the required amount worldToCameraMatrix.translate(0, 0, -fDiagonalLength / 2.0f); //Move the camera back by the required amount
worldToCameraMatrix.rotate(m_xRotation, 0, 1, 0); //rotate around y-axis worldToCameraMatrix.rotate(m_xRotation, 0, 1, 0); //rotate around y-axis
worldToCameraMatrix.rotate(m_yRotation, 1, 0, 0); //rotate around x-axis worldToCameraMatrix.rotate(m_yRotation, 1, 0, 0); //rotate around x-axis
worldToCameraMatrix.translate(-mCenterPoint); //centre the model on the origin worldToCameraMatrix.translate(-centerPoint); //centre the model on the origin
shader.setUniformValue("worldToCameraMatrix", worldToCameraMatrix); shader.setUniformValue("worldToCameraMatrix", worldToCameraMatrix);

5
examples/Basic/OpenGLWidget.h
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@ -52,6 +52,8 @@ public:
//Convert a SurfaceMesh to OpenGL index/vertex buffers //Convert a SurfaceMesh to OpenGL index/vertex buffers
void setSurfaceMeshToRender(const PolyVox::SurfaceMesh<PolyVox::CubicVertex<uint8_t> >& surfaceMesh); void setSurfaceMeshToRender(const PolyVox::SurfaceMesh<PolyVox::CubicVertex<uint8_t> >& surfaceMesh);
void setViewableRegion(PolyVox::Region viewableRegion);
protected: protected:
//Qt OpenGL functions //Qt OpenGL functions
void initializeGL(); void initializeGL();
@ -72,8 +74,7 @@ private:
QPoint m_CurrentMousePos; QPoint m_CurrentMousePos;
//Camera setup //Camera setup
QVector3D mCenterPoint; PolyVox::Region m_viewableRegion;
float mDistFromCenter;
int m_xRotation; int m_xRotation;
int m_yRotation; int m_yRotation;
}; };

1
examples/Basic/main.cpp
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@ -86,6 +86,7 @@ int main(int argc, char *argv[])
//Pass the surface to the OpenGL window //Pass the surface to the OpenGL window
openGLWidget.setSurfaceMeshToRender(mesh); openGLWidget.setSurfaceMeshToRender(mesh);
openGLWidget.setViewableRegion(volData.getEnclosingRegion());
//openGLWidget.setSurfaceMeshToRender(mesh2); //openGLWidget.setSurfaceMeshToRender(mesh2);
//Run the message pump. //Run the message pump.