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#include "3DScene.hpp"
namespace Slic3r {
// caller is responsible for supplying NO lines with zero length
void
_3DScene::_extrusionentity_to_verts_do(const Lines &lines, const std::vector<double> &widths,
const std::vector<double> &heights, bool closed, double top_z, const Point ©,
GLVertexArray* qverts, GLVertexArray* tverts)
{
/* It looks like it's faster without reserving capacity...
// each segment has 4 quads, thus 16 vertices; + 2 caps
qverts->reserve_more(3 * 4 * (4 * lines.size() + 2));
// two triangles for each corner
tverts->reserve_more(3 * 3 * 2 * (lines.size() + 1));
*/
Line prev_line;
Pointf prev_b1, prev_b2;
Vectorf3 prev_xy_left_normal, prev_xy_right_normal;
// loop once more in case of closed loops
bool first_done = false;
for (size_t i = 0; i <= lines.size(); ++i) {
if (i == lines.size()) i = 0;
const Line &line = lines.at(i);
if (i == 0 && first_done && !closed) break;
double len = line.length();
double unscaled_len = unscale(len);
double bottom_z = top_z - heights.at(i);
double middle_z = (top_z + bottom_z) / 2;
double dist = widths.at(i)/2; // scaled
Vectorf v = Vectorf::new_unscale(line.vector());
v.scale(1/unscaled_len);
Pointf a = Pointf::new_unscale(line.a);
Pointf b = Pointf::new_unscale(line.b);
Pointf a1 = a;
Pointf a2 = a;
a1.translate(+dist*v.y, -dist*v.x);
a2.translate(-dist*v.y, +dist*v.x);
Pointf b1 = b;
Pointf b2 = b;
b1.translate(+dist*v.y, -dist*v.x);
b2.translate(-dist*v.y, +dist*v.x);
// calculate new XY normals
Vector n = line.normal();
Vectorf3 xy_right_normal = Vectorf3::new_unscale(n.x, n.y, 0);
xy_right_normal.scale(1/unscaled_len);
Vectorf3 xy_left_normal = xy_right_normal;
xy_left_normal.scale(-1);
if (first_done) {
// if we're making a ccw turn, draw the triangles on the right side, otherwise draw them on the left side
double ccw = line.b.ccw(prev_line);
if (ccw > EPSILON) {
// top-right vertex triangle between previous line and this one
{
// use the normal going to the right calculated for the previous line
tverts->push_norm(prev_xy_right_normal);
tverts->push_vert(prev_b1.x, prev_b1.y, middle_z);
// use the normal going to the right calculated for this line
tverts->push_norm(xy_right_normal);
tverts->push_vert(a1.x, a1.y, middle_z);
// normal going upwards
tverts->push_norm(0,0,1);
tverts->push_vert(a.x, a.y, top_z);
}
// bottom-right vertex triangle between previous line and this one
{
// use the normal going to the right calculated for the previous line
tverts->push_norm(prev_xy_right_normal);
tverts->push_vert(prev_b1.x, prev_b1.y, middle_z);
// normal going downwards
tverts->push_norm(0,0,-1);
tverts->push_vert(a.x, a.y, bottom_z);
// use the normal going to the right calculated for this line
tverts->push_norm(xy_right_normal);
tverts->push_vert(a1.x, a1.y, middle_z);
}
} else if (ccw < -EPSILON) {
// top-left vertex triangle between previous line and this one
{
// use the normal going to the left calculated for the previous line
tverts->push_norm(prev_xy_left_normal);
tverts->push_vert(prev_b2.x, prev_b2.y, middle_z);
// normal going upwards
tverts->push_norm(0,0,1);
tverts->push_vert(a.x, a.y, top_z);
// use the normal going to the right calculated for this line
tverts->push_norm(xy_left_normal);
tverts->push_vert(a2.x, a2.y, middle_z);
}
// bottom-left vertex triangle between previous line and this one
{
// use the normal going to the left calculated for the previous line
tverts->push_norm(prev_xy_left_normal);
tverts->push_vert(prev_b2.x, prev_b2.y, middle_z);
// use the normal going to the right calculated for this line
tverts->push_norm(xy_left_normal);
tverts->push_vert(a2.x, a2.y, middle_z);
// normal going downwards
tverts->push_norm(0,0,-1);
tverts->push_vert(a.x, a.y, bottom_z);
}
}
}
// if this was the extra iteration we were only interested in the triangles
if (first_done && i == 0) break;
prev_line = line;
prev_b1 = b1;
prev_b2 = b2;
prev_xy_right_normal = xy_right_normal;
prev_xy_left_normal = xy_left_normal;
if (!closed) {
// terminate open paths with caps
if (i == 0) {
// normal pointing downwards
qverts->push_norm(0,0,-1);
qverts->push_vert(a.x, a.y, bottom_z);
// normal pointing to the right
qverts->push_norm(xy_right_normal);
qverts->push_vert(a1.x, a1.y, middle_z);
// normal pointing upwards
qverts->push_norm(0,0,1);
qverts->push_vert(a.x, a.y, top_z);
// normal pointing to the left
qverts->push_norm(xy_left_normal);
qverts->push_vert(a2.x, a2.y, middle_z);
}
// we don't use 'else' because both cases are true if we have only one line
if (i == lines.size()-1) {
// normal pointing downwards
qverts->push_norm(0,0,-1);
qverts->push_vert(b.x, b.y, bottom_z);
// normal pointing to the left
qverts->push_norm(xy_left_normal);
qverts->push_vert(b2.x, b2.y, middle_z);
// normal pointing upwards
qverts->push_norm(0,0,1);
qverts->push_vert(b.x, b.y, top_z);
// normal pointing to the right
qverts->push_norm(xy_right_normal);
qverts->push_vert(b1.x, b1.y, middle_z);
}
}
// bottom-right face
{
// normal going downwards
qverts->push_norm(0,0,-1);
qverts->push_norm(0,0,-1);
qverts->push_vert(a.x, a.y, bottom_z);
qverts->push_vert(b.x, b.y, bottom_z);
qverts->push_norm(xy_right_normal);
qverts->push_norm(xy_right_normal);
qverts->push_vert(b1.x, b1.y, middle_z);
qverts->push_vert(a1.x, a1.y, middle_z);
}
// top-right face
{
qverts->push_norm(xy_right_normal);
qverts->push_norm(xy_right_normal);
qverts->push_vert(a1.x, a1.y, middle_z);
qverts->push_vert(b1.x, b1.y, middle_z);
// normal going upwards
qverts->push_norm(0,0,1);
qverts->push_norm(0,0,1);
qverts->push_vert(b.x, b.y, top_z);
qverts->push_vert(a.x, a.y, top_z);
}
// top-left face
{
qverts->push_norm(0,0,1);
qverts->push_norm(0,0,1);
qverts->push_vert(a.x, a.y, top_z);
qverts->push_vert(b.x, b.y, top_z);
qverts->push_norm(xy_left_normal);
qverts->push_norm(xy_left_normal);
qverts->push_vert(b2.x, b2.y, middle_z);
qverts->push_vert(a2.x, a2.y, middle_z);
}
// bottom-left face
{
qverts->push_norm(xy_left_normal);
qverts->push_norm(xy_left_normal);
qverts->push_vert(a2.x, a2.y, middle_z);
qverts->push_vert(b2.x, b2.y, middle_z);
// normal going downwards
qverts->push_norm(0,0,-1);
qverts->push_norm(0,0,-1);
qverts->push_vert(b.x, b.y, bottom_z);
qverts->push_vert(a.x, a.y, bottom_z);
}
first_done = true;
}
}
void
GLVertexArray::load_mesh(const TriangleMesh &mesh)
{
this->reserve_more(3 * 3 * mesh.facets_count());
for (int i = 0; i < mesh.stl.stats.number_of_facets; ++i) {
stl_facet &facet = mesh.stl.facet_start[i];
for (int j = 0; j <= 2; ++j) {
this->push_norm(facet.normal.x, facet.normal.y, facet.normal.z);
this->push_vert(facet.vertex[j].x, facet.vertex[j].y, facet.vertex[j].z);
}
}
}
#ifdef SLIC3RXS
REGISTER_CLASS(GLVertexArray, "GUI::_3DScene::GLVertexArray");
#endif
}
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