void Scene::WireFacet (Facet& f)
{
// number of vertices
int n = f.GetNumVertices();
// remember previous line color
ColorF previous_color = foreground_color;
// =======================================================
// testing: fog for edgelines to get a depth cueing effect
// =======================================================
if (fog_opacity) {
float cx,cy,cz;
f.Center(cx,cy,cz); // wastes time !
SetColor( ColorF_Weighted(0.5*(1-tanh((6/fog_opacity)
*(hypot(cx,cy,cz)-fog_distance-1))),
previous_color,fog_color) );
}
// facet is degenerate (a line)
if (n == 2) // THROW OUT !!!!!!!!!!!!!!
Line( f[0].p,f[1].p );
// loop through edges
else
if (f.edgelines == Facet::Individual) {
for (int i = 0, j = n-1; i < n; j = i++)
if (f.GetEdgeLine(j)) Line( f[j].p,f[i].p );
} else
for (int i = 0, j = n-1; i < n; j = i++)
Line( f[j].p,f[i].p );
// reset previous color
if (fog_opacity) SetColor(previous_color);
}
void stellate (Scene &body, float height)
//
// Adds starlike jags to every facet of the body. The tip
// of a jag is placed in the given height over the center
// of the facet.
//
{
float nx,ny,nz,nk,nn,cx,cy,cz,h;
Vertex* tip;
Facet* f;
int i,j,n;
Scene stella;
for (f = body.TheFacets(); f; f = f->NextFacet() ) {
// calculate the normal form and the center of the facet
f->Normal(nx,ny,nz,nk);
f->Center(cx,cy,cz);
// normalization of the normal vector to unit length
nn = hypot(nx,ny,nz);
// check if facet is degenerate
if (nn == 0) continue;
// add the tip vertex of the jag
h = height / nn;
tip = &stella.AddVertex( cx+h*nx, cy+h*ny, cz+h*nz );
// add three-sided facets for each side of the jag
n = f->GetNumVertices();
for (i = 0, j = n-1; i < n; j = i++) {
Facet& s = stella.AddFacet(3);
s(0) = &stella.AddVertex( *(*f)(j) );
s(1) = &stella.AddVertex( *(*f)(i) );
s(2) = tip;
}
}
// now clear the original
body.Remove();
// and add the stellated body instead (duplicate vertices are now removed)
body.AddScene(stella,Identity);
}
void Scene::WireFrame (void) ///// UNUSED CURRENTLY !!!!!!!!!!!!!!!!!!!!!
{
// remember previous line color
ColorF previous_color = foreground_color;
for (Facet *f = facets; f; f = f->next) {
// clipped facets are invisible
if ( ! f->clipped ) {
// =======================================================
// testing: fog for edgelines to get a depth cueing effect
// =======================================================
if (fog_opacity) {
float cx,cy,cz;
f->Center(cx,cy,cz); // wastes time !
SetColor( ColorF_Weighted(0.5*(1-tanh((6/fog_opacity)
*(hypot(cx,cy,cz)-fog_distance-1))),
previous_color,fog_color) );
}
int n = f->GetNumVertices();
if (n == 2)
Line( (*f)[0].p,(*f)[1].p );
else
for (int i = 0, j = n-1; i < n; j = i++) {
// don't draw line twice for closed bodies
if ( ! facetculling ||
(facetculling && ( &(*f)[j] < &(*f)[i] )) )
Line( (*f)[j].p,(*f)[i].p );
}
}
}
// reset previous color
if (fog_opacity) SetColor(previous_color);
}
void Scene::FlatFacet (Facet& f)
//
// If shading is 'Flat' the facet is drawn using flat shading, otherwise
// if shading is 'false' it will be filled with the background color.
//
// Uses the global intermediate storage array pix.
//
{
int i,j;
float cx,cy,cz,nx,ny,nz,nk;
short r,g,b;
long color;
// number of vertices
int n = f.GetNumVertices();
// facet is degenerate (a line) ----- CURRENTLY DEGENERATE NOT ALLOWED
if (n == 2) {
Line(f[0].p,f[1].p);
return;
}
// can't happen !
if (n < 2 || n > MaxVertices) {
Warn("Scene::FlatFacet: number of vertices out of range");
return;
}
static Material M;
Material *Mp;
if (coloring == Global) {
Mp = f.GetMaterial();
} else {
M.color = f.front;
if (f.material) {
M.ambient = f.material->ambient;
M.specular = f.material->specular;
M.exponent = f.material->exponent;
} else {
M.ambient = mat.ambient;
M.specular = mat.specular;
M.exponent = mat.exponent;
}
Mp = &M;
}
// copy projected vertex coordinates to polygon array
for (i = 0; i < n; i++) pix[i] = f[i].p;
// compute color of facet from reflection properties
if (shading == Facet::Flat) {
f.Normal(nx,ny,nz,nk);
f.Center(cx,cy,cz);
PhongColor(cx,cy,cz,nx,ny,nz,Mp,r,g,b);
// find color in colormap
//color = LookupColor(r,g,b,f.GetMaterial());
color = LookupColor(r,g,b,&mat);
// else if (shading == false) then use the background color
} else
color = backcolor;
// =======================================================
// testing: fog for edgelines to get a depth cueing effect
// =======================================================
ColorF previous_color;
if (fog_opacity) {
previous_color = foreground_color;
SetColor( ColorF_Weighted(0.5*(1-tanh((6/fog_opacity)
*(hypot(cx,cy,cz)-fog_distance-1))),
previous_color,fog_color) );
}
// draw outlines if requested
if (edgelines == 1)
Polygon(n,pix,color,Outline|Fill);
else if (edgelines == 0)
Polygon(n,pix,color,Fill);
else if (edgelines == Facet::Individual ) {
if (f.edgelines == 1)
Polygon(n,pix,color,Outline|Fill);
else if (f.edgelines == 0)
Polygon(n,pix,color,Fill);
else if (f.edgelines == Facet::Individual) {
Polygon(n,pix,color,Fill);
for (i = 0, j = n-1; i < n; j = i++)
if ( f.GetEdgeLine(j) ) Line(pix[j],pix[i]);
}
}
if (fog_opacity) SetColor(previous_color);
}
