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From David Jung, added support for osg::Capsule shape

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This commit is contained in:
Robert Osfield
2004-03-02 20:33:00 +00:00
parent 13d5b50bcf
commit e2469aece9
3 changed files with 374 additions and 37 deletions
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342
src/osg/ShapeDrawable.cpp
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@@ -46,6 +46,7 @@ class DrawShapeVisitor : public ConstShapeVisitor
virtual void apply(const Box&);
virtual void apply(const Cone&);
virtual void apply(const Cylinder&);
virtual void apply(const Capsule&);
virtual void apply(const InfinitePlane&);
virtual void apply(const TriangleMesh&);
@@ -56,12 +57,223 @@ class DrawShapeVisitor : public ConstShapeVisitor
State& _state;
const TessellationHints* _hints;
protected:
enum SphereHalf { SphereTopHalf, SphereBottomHalf };
// helpers for apply( Cylinder | Sphere | Capsule )
void drawCylinderBody(unsigned int numSegments, float radius, float height);
void drawHalfSphere(unsigned int numSegments, unsigned int numRows, float radius, SphereHalf which, float zOffset = 0.0f);
};
void DrawShapeVisitor::drawCylinderBody(unsigned int numSegments, float radius, float height)
{
const float angleDelta = 2.0f*osg::PI/(float)numSegments;
const float texCoordDelta = 1.0f/(float)numSegments;
const float r = radius;
const float h = height;
float basez = -h*0.5f;
float topz = h*0.5f;
float angle = 0.0f;
float texCoord = 0.0f;
bool drawFrontFace = _hints ? _hints->getCreateFrontFace() : true;
bool drawBackFace = _hints ? _hints->getCreateBackFace() : false;
// The only difference between the font & back face loops is that the
// normals are inverted and the order of the vertex pairs is reversed.
// The code is mostly duplicated in order to hoist the back/front face
// test out of the loop for efficiency
glBegin(GL_QUAD_STRIP);
if (drawFrontFace) {
for(unsigned int bodyi=0;
bodyi<numSegments;
++bodyi,angle+=angleDelta,texCoord+=texCoordDelta)
{
float c = cosf(angle);
float s = sinf(angle);
glNormal3f(c,s,0.0f);
glTexCoord2f(texCoord,1.0f);
glVertex3f(c*r,s*r,topz);
glTexCoord2f(texCoord,0.0f);
glVertex3f(c*r,s*r,basez);
}
// do last point by hand to ensure no round off errors.
glNormal3f(1.0f,0.0f,0.0f);
glTexCoord2f(1.0f,1.0f);
glVertex3f(r,0.0f,topz);
glTexCoord2f(1.0f,0.0f);
glVertex3f(r,0.0f,basez);
}
if (drawBackFace) {
for(unsigned int bodyi=0;
bodyi<numSegments;
++bodyi,angle+=angleDelta,texCoord+=texCoordDelta)
{
float c = cosf(angle);
float s = sinf(angle);
glNormal3f(-c,-s,0.0f);
glTexCoord2f(texCoord,0.0f);
glVertex3f(c*r,s*r,basez);
glTexCoord2f(texCoord,1.0f);
glVertex3f(c*r,s*r,topz);
}
// do last point by hand to ensure no round off errors.
glNormal3f(-1.0f,0.0f,0.0f);
glTexCoord2f(1.0f,0.0f);
glVertex3f(r,0.0f,basez);
glTexCoord2f(1.0f,1.0f);
glVertex3f(r,0.0f,topz);
}
glEnd();
}
void DrawShapeVisitor::drawHalfSphere(unsigned int numSegments, unsigned int numRows, float radius, SphereHalf which, float zOffset)
{
float lDelta = osg::PI/(float)numRows;
float vDelta = 1.0f/(float)numRows;
bool top = (which==SphereTopHalf);
bool drawFrontFace = _hints ? _hints->getCreateFrontFace() : true;
bool drawBackFace = _hints ? _hints->getCreateBackFace() : false;
float angleDelta = osg::PI*2.0f/(float)numSegments;
float texCoordHorzDelta = 1.0f/(float)numSegments;
float lBase=-osg::PI*0.5f + (top?(lDelta*(numRows/2)):0.0f);
float rBase=(top?(cosf(lBase)*radius):0.0f);
float zBase=(top?(sinf(lBase)*radius):-radius);
float vBase=(top?(vDelta*(numRows/2)):0.0f);
float nzBase=(top?(sinf(lBase)):-1.0f);
float nRatioBase=(top?(cosf(lBase)):0.0f);
unsigned int rowbegin = top?numRows/2:0;
unsigned int rowend = top?numRows:numRows/2;
for(unsigned int rowi=rowbegin; rowi<rowend; ++rowi)
{
float lTop = lBase+lDelta;
float rTop = cosf(lTop)*radius;
float zTop = sinf(lTop)*radius;
float vTop = vBase+vDelta;
float nzTop= sinf(lTop);
float nRatioTop= cosf(lTop);
glBegin(GL_QUAD_STRIP);
float angle = 0.0f;
float texCoord = 0.0f;
// The only difference between the font & back face loops is that the
// normals are inverted and the order of the vertex pairs is reversed.
// The code is mostly duplicated in order to hoist the back/front face
// test out of the loop for efficiency
if (drawFrontFace) {
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+zOffset);
glNormal3f(c*nRatioBase,s*nRatioBase,nzBase);
glTexCoord2f(texCoord,vBase);
glVertex3f(c*rBase,s*rBase,zBase+zOffset);
}
// 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+zOffset);
glNormal3f(nRatioBase,0.0f,nzBase);
glTexCoord2f(1.0f,vBase);
glVertex3f(rBase,0.0f,zBase+zOffset);
}
if (drawBackFace) {
for(unsigned int topi=0; topi<numSegments;
++topi,angle+=angleDelta,texCoord+=texCoordHorzDelta)
{
float c = cosf(angle);
float s = sinf(angle);
glNormal3f(-c*nRatioBase,-s*nRatioBase,-nzBase);
glTexCoord2f(texCoord,vBase);
glVertex3f(c*rBase,s*rBase,zBase+zOffset);
glNormal3f(-c*nRatioTop,-s*nRatioTop,-nzTop);
glTexCoord2f(texCoord,vTop);
glVertex3f(c*rTop,s*rTop,zTop+zOffset);
}
// do last point by hand to ensure no round off errors.
glNormal3f(-nRatioBase,0.0f,-nzBase);
glTexCoord2f(1.0f,vBase);
glVertex3f(rBase,0.0f,zBase+zOffset);
glNormal3f(-nRatioTop,0.0f,-nzTop);
glTexCoord2f(1.0f,vTop);
glVertex3f(rTop,0.0f,zTop+zOffset);
}
glEnd();
lBase=lTop;
rBase=rTop;
zBase=zTop;
vBase=vTop;
nzBase=nzTop;
nRatioBase=nRatioTop;
}
}
void DrawShapeVisitor::apply(const Sphere& sphere)
{
glPushMatrix();
glTranslatef(sphere.getCenter().x(),sphere.getCenter().y(),sphere.getCenter().z());
@@ -496,6 +708,11 @@ void DrawShapeVisitor::apply(const Cylinder& cylinder)
numSegments = MIN_NUM_SEGMENTS;
}
// cylinder body
if (createBody)
drawCylinderBody(numSegments, cylinder.getRadius(), cylinder.getHeight());
float angleDelta = 2.0f*osg::PI/(float)numSegments;
float texCoordDelta = 1.0f/(float)numSegments;
@@ -508,38 +725,6 @@ void DrawShapeVisitor::apply(const Cylinder& cylinder)
float angle = 0.0f;
float texCoord = 0.0f;
// cylinder body
if (createBody) {
glBegin(GL_QUAD_STRIP);
for(unsigned int bodyi=0;
bodyi<numSegments;
++bodyi,angle+=angleDelta,texCoord+=texCoordDelta)
{
float c = cosf(angle);
float s = sinf(angle);
glNormal3f(c,s,0.0f);
glTexCoord2f(texCoord,1.0f);
glVertex3f(c*r,s*r,topz);
glTexCoord2f(texCoord,0.0f);
glVertex3f(c*r,s*r,basez);
}
// do last point by hand to ensure no round off errors.
glNormal3f(1.0f,0.0f,0.0f);
glTexCoord2f(1.0f,1.0f);
glVertex3f(r,0.0f,topz);
glTexCoord2f(1.0f,0.0f);
glVertex3f(r,0.0f,basez);
glEnd();
}
// cylinder top
if (createTop) {
glBegin(GL_TRIANGLE_FAN);
@@ -597,6 +782,51 @@ void DrawShapeVisitor::apply(const Cylinder& cylinder)
glPopMatrix();
}
void DrawShapeVisitor::apply(const Capsule& capsule)
{
glPushMatrix();
glTranslatef(capsule.getCenter().x(),capsule.getCenter().y(),capsule.getCenter().z());
if (!capsule.zeroRotation())
{
Matrix rotation(capsule.getRotationMatrix());
glMultMatrix(rotation.ptr());
}
// evaluate hints
bool createBody = (_hints ? _hints->getCreateBody() : true);
bool createTop = (_hints ? _hints->getCreateTop() : true);
bool createBottom = (_hints ? _hints->getCreateBottom() : true);
unsigned int numSegments = 40;
unsigned int numRows = 20;
if (_hints && _hints->getDetailRatio() != 1.0f) {
float ratio = _hints->getDetailRatio();
numSegments = (unsigned int) (numSegments * ratio);
if (numSegments < MIN_NUM_SEGMENTS)
numSegments = MIN_NUM_SEGMENTS;
numRows = (unsigned int) (numRows * ratio);
if (numRows < MIN_NUM_ROWS)
numRows = MIN_NUM_ROWS;
}
// capsule cylindrical body
if (createBody)
drawCylinderBody(numSegments, capsule.getRadius(), capsule.getHeight());
// capsule top cap
if (createTop)
drawHalfSphere(numSegments, numRows, capsule.getRadius(), SphereTopHalf, capsule.getHeight()/2.0f);
// capsule bottom cap
if (createBottom)
drawHalfSphere(numSegments, numRows, capsule.getRadius(), SphereBottomHalf, -capsule.getHeight()/2.0f);
glPopMatrix();
}
void DrawShapeVisitor::apply(const InfinitePlane& plane)
{
std::cout << "draw a Plane ("<<plane<<") "<<std::endl;
@@ -814,6 +1044,7 @@ class ComputeBoundShapeVisitor : public ConstShapeVisitor
virtual void apply(const Box&);
virtual void apply(const Cone&);
virtual void apply(const Cylinder&);
virtual void apply(const Capsule&);
virtual void apply(const InfinitePlane&);
virtual void apply(const TriangleMesh&);
@@ -931,6 +1162,43 @@ void ComputeBoundShapeVisitor::apply(const Cylinder& cylinder)
}
}
void ComputeBoundShapeVisitor::apply(const Capsule& capsule)
{
if (capsule.zeroRotation())
{
Vec3 halfLengths(capsule.getRadius(),capsule.getRadius(),capsule.getHeight()*0.5f + capsule.getRadius());
_bb.expandBy(capsule.getCenter()-halfLengths);
_bb.expandBy(capsule.getCenter()+halfLengths);
}
else
{
float r = capsule.getRadius();
float z = capsule.getHeight()*0.5f + capsule.getRadius();
Vec3 base_1(Vec3(-r,-r,-z));
Vec3 base_2(Vec3(r,-r,-z));
Vec3 base_3(Vec3(r,r,-z));
Vec3 base_4(Vec3(-r,r,-z));
Vec3 top_1(Vec3(-r,-r,z));
Vec3 top_2(Vec3(r,-r,z));
Vec3 top_3(Vec3(r,r,z));
Vec3 top_4(Vec3(-r,r,z));
Matrix matrix = capsule.getRotationMatrix();
_bb.expandBy(capsule.getCenter()+base_1*matrix);
_bb.expandBy(capsule.getCenter()+base_2*matrix);
_bb.expandBy(capsule.getCenter()+base_3*matrix);
_bb.expandBy(capsule.getCenter()+base_4*matrix);
_bb.expandBy(capsule.getCenter()+top_1*matrix);
_bb.expandBy(capsule.getCenter()+top_2*matrix);
_bb.expandBy(capsule.getCenter()+top_3*matrix);
_bb.expandBy(capsule.getCenter()+top_4*matrix);
}
}
void ComputeBoundShapeVisitor::apply(const InfinitePlane&)
{
// can't compute the bounding box of an infinite plane!!! :-)
@@ -1043,6 +1311,7 @@ class PrimitiveShapeVisitor : public ConstShapeVisitor
virtual void apply(const Box&);
virtual void apply(const Cone&);
virtual void apply(const Cylinder&);
virtual void apply(const Capsule&);
virtual void apply(const InfinitePlane&);
virtual void apply(const TriangleMesh&);
@@ -1385,6 +1654,13 @@ void PrimitiveShapeVisitor::apply(const Cylinder& cylinder)
_functor.end();
}
void PrimitiveShapeVisitor::apply(const Capsule& /*capsule*/)
{
#if 0
notify(NOTICE)<<"Warning: PrimitiveShapeVisitor doesn't implement apply(Capsule&) (yet)."<<std::endl;
#endif
}
void PrimitiveShapeVisitor::apply(const InfinitePlane& plane)
{
std::cout << "Primitive a Plane ("<<plane<<") "<<std::endl;