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
_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);
}
}
}
}
void
SmTextureText2::rayPick(SoRayPickAction * action)
{
//FIXME: Support multiple strings at one position (multiline text)?
//For now, assumes 1 string at each position
SoState * state = action->getState();
const SbString * strings;
const int numstrings = this->getStrings(state, strings);
const int32_t * indices;
const int numindices = this->getStringIndices(state, indices);
const int num = numindices > 0 ? numindices : numstrings;
this->computeObjectSpaceRay(action);
const SmTextureFont::FontImage * font = SmTextureFontElement::get(state);
SoMaterialBindingElement::Binding binding = SoMaterialBindingElement::get(state);
for (int i = 0; i < num; i++){
int idx = numindices > 0 ? indices[i] : i;
SbVec3f p0, p1, p2, p3;
this->buildStringQuad(action, idx, p0, p1, p2, p3);
SbVec3f isect;
SbVec3f bary;
SbBool front;
SbBool hit = action->intersect(p0, p1, p2, isect, bary, front);
if (!hit) hit = action->intersect(p0, p2, p3, isect, bary, front);
if (hit && action->isBetweenPlanes(isect)) {
if (!this->pickOnPixel.getValue()){
SoPickedPoint * pp = action->addIntersection(isect);
if (pp) {
SoTextDetail * detail = new SoTextDetail;
detail->setStringIndex(idx);
detail->setCharacterIndex(0);
pp->setDetail(detail, this);
pp->setMaterialIndex(binding == SoMaterialBindingElement::OVERALL ? 0 : idx);
pp->setObjectNormal(SbVec3f(0.0f, 0.0f, 1.0f));
}
return;//We only calculate 1 picked point per SmTextureText2 instance
}
//else:
//FIXME: Pixel coordinates are off by at least one pixel.
//Probably a rounding issue, or related to using center vs lowerleft coordinates of each pixel
//Find out if the fault lies here, in buildStringQuad or in renderString... wiesener 20091102
// find normalized 2D hitpoint on quad
float h = (p3-p0).length();
float w = (p1-p0).length();
SbLine horizontal(p2, p3);
SbVec3f ptonline = horizontal.getClosestPoint(isect);
float vdist = (ptonline-isect).length();
vdist /= h;
SbLine vertical(p0, p3);
ptonline = vertical.getClosestPoint(isect);
float hdist = (ptonline-isect).length();
hdist /= w;
const SbString & string = strings[idx];
int width_pixels = font->stringWidth(string);
int height_pixels = font->height();
int px = static_cast<int>(width_pixels * hdist);
int py = static_cast<int>(height_pixels * vdist);
const char * cstr = string.getString();
int charindex = 0;
int lastwidth = 0;
while (charindex < string.getLength()){
unsigned char c = cstr[charindex];
int width = font->getKerning(c, 0);//should return "true width" of the glyph
int xoffset = font->getXOffset(c);//will be negative for fonts extending to the left
if (lastwidth + width > px){//we have a character, now let's see if it is a pixel hit
SbVec2s glyphpos = font->getGlyphPositionPixels(c);//upper left pixel
int x = px - lastwidth - xoffset + glyphpos[0];
int y = py + glyphpos[1];
const SbImage * img = font->getGLImage()->getImage();
SbVec2s size;
int nc;
const unsigned char * pixels = img->getValue(size, nc);
//#define DEBUG_CHARACTER
#ifdef DEBUG_CHARACTER
for (int fooy = 0; fooy < font->height(); fooy++){
for (int foox = 0; foox < width - xoffset; foox++){
int line = glyphpos[1] + fooy;
char transparency = pixels[(line * size[0] + foox + glyphpos[0]) * nc];
if (fooy == py && foox == px - lastwidth - xoffset) printf("X");
else printf(transparency != 0 ? "O" : " ");
}
printf("\n");
}
printf("--------\n");
#endif //DEBUG_CHARACTER
const unsigned char * pixel = &pixels[(y * size[0] + x) * nc];
if (pixel[0] != 0){//not completely transparent
SoPickedPoint * pp = action->addIntersection(isect);
if (pp) {
SoTextDetail * detail = new SoTextDetail;
detail->setStringIndex(idx);
detail->setCharacterIndex(0);
pp->setDetail(detail, this);
pp->setMaterialIndex(binding == SoMaterialBindingElement::OVERALL ? 0 : idx);
pp->setObjectNormal(SbVec3f(0.0f, 0.0f, 1.0f));
}
return;//We only calculate 1 picked point per SmTextureText2 instance
}
}
unsigned char c2 = cstr[charindex + 1];
lastwidth += font->getKerning(c, c2);//add the kerning instead of width here
if (lastwidth + font->getXOffset(c2) > px) break;//passed the point clicked
charindex++;
}
}
}
}