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SLA gizmo now respects the clipping plane when rendering points and raycasting mouse onto mesh

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This commit is contained in:
Lukas Matena 2019-03-20 08:48:42 +01:00
parent fd1f9d65fb
commit bc9164e40c
4 changed files with 74 additions and 27 deletions
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47
src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
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@ -157,6 +157,11 @@ void GLGizmoSlaSupports::render_points(const Selection& selection, bool picking)
const Transform3d& instance_scaling_matrix_inverse = vol->get_instance_transformation().get_matrix(true, true, false, true).inverse();
const Transform3d& instance_matrix = vol->get_instance_transformation().get_matrix();
// we'll recover current look direction from the modelview matrix (in world coords):
Eigen::Matrix<double, 4, 4, Eigen::DontAlign> modelview_matrix;
::glGetDoublev(GL_MODELVIEW_MATRIX, modelview_matrix.data());
Vec3d direction_to_camera(modelview_matrix.data()[2], modelview_matrix.data()[6], modelview_matrix.data()[10]);
::glPushMatrix();
::glTranslated(0.0, 0.0, z_shift);
::glMultMatrixd(instance_matrix.data());
@ -167,6 +172,9 @@ void GLGizmoSlaSupports::render_points(const Selection& selection, bool picking)
const sla::SupportPoint& support_point = m_editing_mode_cache[i].support_point;
const bool& point_selected = m_editing_mode_cache[i].selected;
if (is_point_clipped(support_point.pos.cast<double>(), direction_to_camera, z_shift))
continue;
// First decide about the color of the point.
if (picking) {
std::array<float, 3> color = picking_color_component(i);
@ -285,6 +293,8 @@ void GLGizmoSlaSupports::update_mesh()
m_AABB.init(m_V, m_F);
}
// Unprojects the mouse position on the mesh and return the hit point and normal of the facet.
// The function throws if no intersection if found.
std::pair<Vec3f, Vec3f> GLGizmoSlaSupports::unproject_on_mesh(const Vec2d& mouse_pos)
{
// if the gizmo doesn't have the V, F structures for igl, calculate them first:
@ -303,12 +313,15 @@ std::pair<Vec3f, Vec3f> GLGizmoSlaSupports::unproject_on_mesh(const Vec2d& mouse
::gluUnProject(mouse_pos(0), viewport(3)-mouse_pos(1), 0.f, modelview_matrix.data(), projection_matrix.data(), viewport.data(), &point1(0), &point1(1), &point1(2));
::gluUnProject(mouse_pos(0), viewport(3)-mouse_pos(1), 1.f, modelview_matrix.data(), projection_matrix.data(), viewport.data(), &point2(0), &point2(1), &point2(2));
igl::Hit hit;
std::vector<igl::Hit> hits;
const Selection& selection = m_parent.get_selection();
const GLVolume* volume = selection.get_volume(*selection.get_volume_idxs().begin());
double z_offset = volume->get_sla_shift_z();
// we'll recover current look direction from the modelview matrix (in world coords):
Vec3d direction_to_camera(modelview_matrix.data()[2], modelview_matrix.data()[6], modelview_matrix.data()[10]);
point1(2) -= z_offset;
point2(2) -= z_offset;
@ -317,17 +330,37 @@ std::pair<Vec3f, Vec3f> GLGizmoSlaSupports::unproject_on_mesh(const Vec2d& mouse
point1 = inv * point1;
point2 = inv * point2;
if (!m_AABB.intersect_ray(m_V, m_F, point1.cast<float>(), (point2-point1).cast<float>(), hit))
if (!m_AABB.intersect_ray(m_V, m_F, point1.cast<float>(), (point2-point1).cast<float>(), hits))
throw std::invalid_argument("unproject_on_mesh(): No intersection found.");
int fid = hit.id; // facet id
Vec3f bc(1-hit.u-hit.v, hit.u, hit.v); // barycentric coordinates of the hit
Vec3f a = (m_V.row(m_F(fid, 1)) - m_V.row(m_F(fid, 0)));
Vec3f b = (m_V.row(m_F(fid, 2)) - m_V.row(m_F(fid, 0)));
std::sort(hits.begin(), hits.end(), [](const igl::Hit& a, const igl::Hit& b) { return a.t < b.t; });
// Now let's iterate through the points and find the first that is not clipped:
unsigned int i=0;
Vec3f bc;
Vec3f a;
Vec3f b;
Vec3f result;
for (i=0; i<hits.size(); ++i) {
igl::Hit& hit = hits[i];
int fid = hit.id; // facet id
bc = Vec3f(1-hit.u-hit.v, hit.u, hit.v); // barycentric coordinates of the hit
a = (m_V.row(m_F(fid, 1)) - m_V.row(m_F(fid, 0)));
b = (m_V.row(m_F(fid, 2)) - m_V.row(m_F(fid, 0)));
result = bc(0) * m_V.row(m_F(fid, 0)) + bc(1) * m_V.row(m_F(fid, 1)) + bc(2)*m_V.row(m_F(fid, 2));
if (m_clipping_plane_distance == 0.f || !is_point_clipped(result.cast<double>(), direction_to_camera, z_offset))
break;
}
if (i==hits.size() || (hits.size()-i) % 2 != 0) {
// All hits are either clipped, or there is an odd number of unclipped
// hits - meaning the nearest must be from inside the mesh.
throw std::invalid_argument("unproject_on_mesh(): No intersection found.");
}
// Calculate and return both the point and the facet normal.
return std::make_pair(
bc(0) * m_V.row(m_F(fid, 0)) + bc(1) * m_V.row(m_F(fid, 1)) + bc(2)*m_V.row(m_F(fid, 2)),
result,
a.cross(b)
);
}