void
_SoNurbsPickV4SurfaceMap::intersectTriangle()
//
////////////////////////////////////////////////////////////////////////
{
SbVec3f point;
SbVec3f barycentric;
SbBool onFrontSide;
SoPickedPoint *pp;
if (!pickAction->intersect(SP[cacheIndices[0]].p,
SP[cacheIndices[1]].p,
SP[curPrimIndex].p,
point, barycentric, onFrontSide))
return;
pp = pickAction->addIntersection(point);
if (pp != NULL) {
SbVec3f norm, n0, n1, n2;
SbVec4f texCoord;
// Compute normal by interpolating vertex normals using
// barycentric coordinates
n0 = SP[0].norm;
n1 = SP[1].norm;
n2 = SP[2].norm;
norm.setValue(barycentric, n0, n1, n2);
norm.normalize();
pp->setObjectNormal(norm);
pp->setMaterialIndex(0);
// Compute texture coordinates the same way
texCoord[0] = barycentric[0] * TP[cacheIndices[0]][0] +
barycentric[1] * TP[cacheIndices[1]][0] +
barycentric[2] * TP[curPrimIndex][0];
texCoord[1] = barycentric[0] * TP[cacheIndices[0]][1] +
barycentric[1] * TP[cacheIndices[1]][1] +
barycentric[2] * TP[curPrimIndex][1];
texCoord[2] = 0.0;
texCoord[3] = 1.0;
pp->setObjectTextureCoords(texCoord);
}
}
void SoRing::rayPick(SoRayPickAction * action)
{
// Is it pickable ?
if ( ! shouldRayPick(action) ) return;
// compute the picking ray in our current object space
computeObjectSpaceRay(action);
SoPickedPoint* pp;
SbVec3f intersection;
SbPlane XY(SbVec3f(0,0,1),0);
if ( XY.intersect(action->getLine(), intersection) )
{
float x, y, z;
intersection.getValue(x, y, z);
// back to the case of a disk centered at (0,0)
float Xc, Yc;
center.getValue().getValue(Xc,Yc);
x -= Xc;
y -= Yc;
// within radius ?
if ( sqrt(x*x+y*y+z*z) > outerRadius.getValue() ) return;
if ( sqrt(x*x+y*y+z*z) < innerRadius.getValue() ) return;
// within angular section ?
float theta = sweepAngle.getValue();
float angle = atan2(y,x);
if ( angle < 0. ) angle += 2*M_PI;
if ( theta != 360 &&
angle*180.F/M_PI > theta ) return;
if ( action->isBetweenPlanes(intersection) &&
(pp = action->addIntersection(intersection)) != NULL )
{
pp->setObjectNormal(normal);
pp->setObjectTextureCoords(SbVec4f(0.5f*(1+cos(angle)),
0.5f*(1+sin(angle)), 0, 1));
}
}
}
void
_SoNurbsPickV4CurveMap::intersectLine()
//
////////////////////////////////////////////////////////////////////////
{
SbVec3f point;
SoPickedPoint *pp;
if (!pickAction->intersect(CP[0], CP[1], point))
return;
pp = pickAction->addIntersection(point);
if (pp != NULL) {
SbVec3f norm;
SbVec4f texCoord;
float ratioFromV1;
// Compute normal as vector pointing back along the pick ray.
norm = -pickAction->getLine().getDirection();
norm.normalize();
pp->setObjectNormal(norm);
pp->setMaterialIndex(0);
// Compute interpolated texture coordinate
ratioFromV1 = ((point - CP[0]).length() /
(CP[1] - CP[0]).length());
texCoord[0] = (TP[0][0] * (1.0 - ratioFromV1) +
TP[1][0] * ratioFromV1);
texCoord[1] = (TP[0][1] * (1.0 - ratioFromV1) +
TP[1][1] * ratioFromV1);
texCoord[2] = 0.0;
texCoord[3] = 1.0;
pp->setObjectTextureCoords(texCoord);
}
}
void
SoCylinder::rayPick(SoRayPickAction *action)
//
////////////////////////////////////////////////////////////////////////
{
// First see if the object is pickable
if (! shouldRayPick(action))
return;
int curParts =(parts.isIgnored() ? ALL : parts.getValue());
SbLine pickLine;
float radius, halfHeight;
SbVec3f enterPoint, exitPoint, normal;
SbVec4f texCoord;
SoPickedPoint *pp;
SoCylinderDetail *detail;
SbBool materialPerPart;
int numHits = 0;
// Compute the picking ray in our current object space
computeObjectSpaceRay(action);
// Get size of this cylinder
getSize(radius, halfHeight);
// Construct an infinite cylinder to test sides for intersection
SbCylinder infiniteCyl;
infiniteCyl.setRadius(radius);
SoMaterialBindingElement::Binding mbe =
SoMaterialBindingElement::get(action->getState());
materialPerPart =
(mbe == SoMaterialBindingElement::PER_PART_INDEXED ||
mbe == SoMaterialBindingElement::PER_PART);
// See if the line intersects the cylinder
if (HAS_PART(curParts, SIDES) &&
infiniteCyl.intersect(action->getLine(), enterPoint, exitPoint)) {
// See if the enter point is within the real cylinder and is
// between the near and far clipping planes.
if (enterPoint[1] <= halfHeight && enterPoint[1] >= -halfHeight) {
numHits++;
if (action->isBetweenPlanes(enterPoint) &&
(pp = action->addIntersection(enterPoint)) != NULL) {
// The normal at the point is the same as the point but
// with a 0 y coordinate
normal.setValue(enterPoint[0], 0.0, enterPoint[2]);
normal.normalize();
pp->setObjectNormal(normal);
texCoord.setValue(atan2f(enterPoint[0], enterPoint[2])
* (1.0 / (2.0 * M_PI)) + 0.5,
(enterPoint[1] + halfHeight) /
(2.0 * halfHeight),
0.0, 1.0);
pp->setObjectTextureCoords(texCoord);
detail = new SoCylinderDetail();
detail->setPart(SIDES);
pp->setDetail(detail, this);
}
}
// Do same for exit point
if (exitPoint[1] <= halfHeight && exitPoint[1] >= -halfHeight) {
numHits++;
if (action->isBetweenPlanes(exitPoint) &&
(pp = action->addIntersection(exitPoint)) != NULL) {
normal.setValue(exitPoint[0], 0.0, exitPoint[2]);
normal.normalize();
pp->setObjectNormal(normal);
texCoord.setValue(atan2f(exitPoint[0], exitPoint[2])
* (1.0 / (2.0 * M_PI)) + 0.5,
(exitPoint[1] + halfHeight) /
(2.0 * halfHeight),
0.0, 1.0);
pp->setObjectTextureCoords(texCoord);
detail = new SoCylinderDetail();
detail->setPart(SIDES);
pp->setDetail(detail, this);
}
}
}
// If we haven't hit the cylinder twice already, check for an
// intersection with the top face
if (numHits < 2 && HAS_PART(curParts, TOP)) {
SbVec3f norm(0.0, 1.0, 0.0);
// Construct a plane containing the top face
SbPlane topFacePlane(norm, halfHeight);
// See if the ray hits this plane
if (topFacePlane.intersect(action->getLine(), enterPoint)) {
// See if the intersection is within the correct radius
// and is within the clipping planes
float distFromYAxisSquared = (enterPoint[0] * enterPoint[0] +
enterPoint[2] * enterPoint[2]);
if (distFromYAxisSquared <= radius * radius) {
numHits++;
if (action->isBetweenPlanes(enterPoint) &&
(pp = action->addIntersection(enterPoint)) != NULL) {
pp->setObjectNormal(norm);
texCoord.setValue(0.5 + enterPoint[0] / (2.0 * radius),
0.5 - enterPoint[2] / (2.0 * radius),
0.0, 1.0);
pp->setObjectTextureCoords(texCoord);
if (materialPerPart)
pp->setMaterialIndex(1);
detail = new SoCylinderDetail();
detail->setPart(TOP);
pp->setDetail(detail, this);
}
}
}
}
// If we haven't hit the cylinder twice already, check for an
// intersection with the bottom face
if (numHits < 2 && HAS_PART(curParts, BOTTOM)) {
SbVec3f norm(0.0, -1.0, 0.0);
// Construct a plane containing the bottom face
SbPlane bottomFacePlane(norm, halfHeight);
// See if the ray hits this plane
if (bottomFacePlane.intersect(action->getLine(), enterPoint)) {
// See if the intersection is within the correct radius
// and is within the clipping planes
float distFromYAxisSquared = (enterPoint[0] * enterPoint[0] +
enterPoint[2] * enterPoint[2]);
if (distFromYAxisSquared <= radius * radius &&
action->isBetweenPlanes(enterPoint) &&
(pp = action->addIntersection(enterPoint)) != NULL) {
pp->setObjectNormal(norm);
texCoord.setValue(0.5 + enterPoint[0] / (2.0 * radius),
0.5 + enterPoint[2] / (2.0 * radius),
0.0, 1.0);
pp->setObjectTextureCoords(texCoord);
if (materialPerPart)
pp->setMaterialIndex(2);
detail = new SoCylinderDetail();
detail->setPart(BOTTOM);
pp->setDetail(detail, this);
}
}
}
}
