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feat: Render OpenCASCADE faces in viewport

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Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>
This commit is contained in:
Tanner Collin
2026-02-17 17:54:59 -07:00
parent e2dfdf1600
commit 95b4db5191
1 changed files with 45 additions and 0 deletions
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45
src/ViewportWidget.cpp
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@@ -30,6 +30,13 @@
#include <QVector>
#include <map>
#include <BRepMesh_IncrementalMesh.hxx>
#include <TopExp_Explorer.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Face.hxx>
#include <Poly_Triangulation.hxx>
#include <BRep_Tool.hxx>
struct PntComparator {
bool operator()(const gp_Pnt& a, const gp_Pnt& b) const {
// A tolerance is needed for floating point comparisons
@@ -649,6 +656,44 @@ void ViewportWidget::drawSketch(const SketchFeature* sketch)
}
}
// Draw faces
if (!sketch->shape().IsNull()) {
BRepMesh_IncrementalMesh(sketch->shape(), 0.1); // Linear deflection
QVector<GLfloat> faceVertices;
TopExp_Explorer explorer(sketch->shape(), TopAbs_FACE);
for (; explorer.More(); explorer.Next()) {
TopoDS_Face face = TopoDS::Face(explorer.Current());
TopLoc_Location location;
Handle(Poly_Triangulation) triangulation = BRep_Tool::Triangulation(face, location);
if (!triangulation.IsNull()) {
const TColgp_Array1OfPnt& nodes = triangulation->Nodes();
const Poly_Array1OfTriangle& triangles = triangulation->Triangles();
for (int i = 1; i <= triangles.Length(); ++i) {
const Poly_Triangle& triangle = triangles(i);
gp_Pnt p1 = nodes(triangle.Value(1)).Transformed(location);
gp_Pnt p2 = nodes(triangle.Value(2)).Transformed(location);
gp_Pnt p3 = nodes(triangle.Value(3)).Transformed(location);
faceVertices << p1.X() << p1.Y() << p1.Z();
faceVertices << p2.X() << p2.Y() << p2.Z();
faceVertices << p3.X() << p3.Y() << p3.Z();
}
}
}
if (!faceVertices.isEmpty()) {
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
m_shaderProgram->setUniformValue(m_colorLoc, QVector4D(0.5f, 0.5f, 1.0f, 0.5f));
m_vbo.bind();
m_vbo.allocate(faceVertices.constData(), faceVertices.size() * sizeof(GLfloat));
glDrawArrays(GL_TRIANGLES, 0, faceVertices.size() / 3);
glDisable(GL_BLEND);
}
}
glEnable(GL_DEPTH_TEST);
}