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Added support for draw back then front faces of the osg::Sphere shape

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This commit is contained in:
Robert Osfield
2004-02-11 12:06:37 +00:00
parent 61cb27806f
commit 2f63f0fa21
1 changed files with 124 additions and 46 deletions
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170
src/osg/ShapeDrawable.cpp
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@@ -61,10 +61,14 @@ class DrawShapeVisitor : public ConstShapeVisitor
void DrawShapeVisitor::apply(const Sphere& sphere)
{
glPushMatrix();
glTranslatef(sphere.getCenter().x(),sphere.getCenter().y(),sphere.getCenter().z());
bool drawFrontFace = _hints ? _hints->getCreateFrontFace() : true;
bool drawBackFace = _hints ? _hints->getCreateBackFace() : false;
unsigned int numSegments = 40;
unsigned int numRows = 20;
if (_hints && _hints->getDetailRatio() != 1.0f) {
@@ -83,70 +87,144 @@ void DrawShapeVisitor::apply(const Sphere& sphere)
float angleDelta = osg::PI*2.0f/(float)numSegments;
float texCoordHorzDelta = 1.0f/(float)numSegments;
float lBase=-osg::PI*0.5f;
float rBase=0.0f;
float zBase=-sphere.getRadius();
float vBase=0.0f;
float nzBase=-1.0f;
float nRatioBase=0.0f;
for(unsigned int rowi=0; rowi<numRows; ++rowi)
{
if (drawBackFace)
{
float lBase=-osg::PI*0.5f;
float rBase=0.0f;
float zBase=-sphere.getRadius();
float vBase=0.0f;
float nzBase=-1.0f;
float nRatioBase=0.0f;
float lTop = lBase+lDelta;
float rTop = cosf(lTop)*sphere.getRadius();
float zTop = sinf(lTop)*sphere.getRadius();
float vTop = vBase+vDelta;
float nzTop= sinf(lTop);
float nRatioTop= cosf(lTop);
for(unsigned int rowi=0; rowi<numRows; ++rowi)
{
glBegin(GL_QUAD_STRIP);
float lTop = lBase+lDelta;
float rTop = cosf(lTop)*sphere.getRadius();
float zTop = sinf(lTop)*sphere.getRadius();
float vTop = vBase+vDelta;
float nzTop= sinf(lTop);
float nRatioTop= cosf(lTop);
float angle = 0.0f;
float texCoord = 0.0f;
glBegin(GL_QUAD_STRIP);
for(unsigned int topi=0; topi<numSegments;
++topi,angle+=angleDelta,texCoord+=texCoordHorzDelta)
{
float angle = 0.0f;
float texCoord = 0.0f;
float c = cosf(angle);
float s = sinf(angle);
for(unsigned int topi=0; topi<numSegments;
++topi,angle+=angleDelta,texCoord+=texCoordHorzDelta)
{
glNormal3f(c*nRatioTop,s*nRatioTop,nzTop);
float c = cosf(angle);
float s = sinf(angle);
glTexCoord2f(texCoord,vTop);
glVertex3f(c*rTop,s*rTop,zTop);
glNormal3f(-c*nRatioBase,-s*nRatioBase,-nzBase);
glNormal3f(c*nRatioBase,s*nRatioBase,nzBase);
glTexCoord2f(texCoord,vBase);
glVertex3f(c*rBase,s*rBase,zBase);
glTexCoord2f(texCoord,vBase);
glVertex3f(c*rBase,s*rBase,zBase);
glNormal3f(-c*nRatioTop,-s*nRatioTop,-nzTop);
}
glTexCoord2f(texCoord,vTop);
glVertex3f(c*rTop,s*rTop,zTop);
// do last point by hand to ensure no round off errors.
glNormal3f(nRatioTop,0.0f,nzTop);
glTexCoord2f(1.0f,vTop);
glVertex3f(rTop,0.0f,zTop);
}
glNormal3f(nRatioBase,0.0f,nzBase);
glTexCoord2f(1.0f,vBase);
glVertex3f(rBase,0.0f,zBase);
// do last point by hand to ensure no round off errors.
glNormal3f(-nRatioBase,0.0f,-nzBase);
glEnd();
lBase=lTop;
rBase=rTop;
zBase=zTop;
vBase=vTop;
nzBase=nzTop;
nRatioBase=nRatioTop;
glTexCoord2f(1.0f,vBase);
glVertex3f(rBase,0.0f,zBase);
glNormal3f(-nRatioTop,0.0f,-nzTop);
glTexCoord2f(1.0f,vTop);
glVertex3f(rTop,0.0f,zTop);
glEnd();
lBase=lTop;
rBase=rTop;
zBase=zTop;
vBase=vTop;
nzBase=nzTop;
nRatioBase=nRatioTop;
}
}
if (drawFrontFace)
{
float lBase=-osg::PI*0.5f;
float rBase=0.0f;
float zBase=-sphere.getRadius();
float vBase=0.0f;
float nzBase=-1.0f;
float nRatioBase=0.0f;
for(unsigned int rowi=0; rowi<numRows; ++rowi)
{
float lTop = lBase+lDelta;
float rTop = cosf(lTop)*sphere.getRadius();
float zTop = sinf(lTop)*sphere.getRadius();
float vTop = vBase+vDelta;
float nzTop= sinf(lTop);
float nRatioTop= cosf(lTop);
glBegin(GL_QUAD_STRIP);
float angle = 0.0f;
float texCoord = 0.0f;
for(unsigned int topi=0; topi<numSegments;
++topi,angle+=angleDelta,texCoord+=texCoordHorzDelta)
{
float c = cosf(angle);
float s = sinf(angle);
glNormal3f(c*nRatioTop,s*nRatioTop,nzTop);
glTexCoord2f(texCoord,vTop);
glVertex3f(c*rTop,s*rTop,zTop);
glNormal3f(c*nRatioBase,s*nRatioBase,nzBase);
glTexCoord2f(texCoord,vBase);
glVertex3f(c*rBase,s*rBase,zBase);
}
// do last point by hand to ensure no round off errors.
glNormal3f(nRatioTop,0.0f,nzTop);
glTexCoord2f(1.0f,vTop);
glVertex3f(rTop,0.0f,zTop);
glNormal3f(nRatioBase,0.0f,nzBase);
glTexCoord2f(1.0f,vBase);
glVertex3f(rBase,0.0f,zBase);
glEnd();
lBase=lTop;
rBase=rTop;
zBase=zTop;
vBase=vTop;
nzBase=nzTop;
nRatioBase=nRatioTop;
}
}
glPopMatrix();
}