Draw 2D freeform cross-sections, arrange them along Z, and generate a closed 3D mesh with Phong shading. Export to OBJ for use in other tools.
| In-app 3D view | Same model in Blender | OBJ export dialog |
|---|---|---|
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- Draw & stack — sketch closed 2D shapes, save each as a cross-section, then arrange them at arbitrary Z depths.
- Auto mesh — cross-sections are resampled to uniform point counts, connected into a triangulated surface with top/bottom caps, and rendered with Phong lighting.
- Orbit & inspect — drag to rotate the model, scroll to zoom. Per-keyframe Z sliders let you tweak the spacing.
- OBJ export — writes vertex positions, normals, and triangular face indices for import into Blender, Maya, etc.
- Ghost overlay — the previously saved frame appears as a faint guide while drawing the next one, helping you align shapes.
- OpenGL ES 3.0 — runs on a lightweight ES profile context with GLFW + ImGui.
mkdir build && cd build && cmake .. && makeOr use ./run.sh. The binary teddyimpl is placed in the repo root.
System dependencies: OpenGL dev libraries (libglfw3-dev, libopengl-dev, or distro equivalents). GLM, GLAD, ImGui, and ImGuiFileDialog are fetched automatically via CMake FetchContent.
Must run from the repo root — shader paths are hardcoded as ../src/shaders/ relative to CWD.
./teddyimpl| Action | Input |
|---|---|
| Draw | Left-click drag in edit mode |
| Erase last point | Right-click |
| Clear canvas | Tab |
| Orbit model | Left-click drag in view mode |
| Zoom | Scroll wheel in view mode |
| Quit | Escape |
Edit mode (default on launch): draw a closed 2D freeform shape on the canvas. Click "Save Frame" to push it onto the keyframe stack — a new blank canvas appears on top for the next cross-section.
View mode (uncheck "Edit Mode"): all keyframes are resampled to equal point counts, sorted by Z, and connected into a triangulated surface mesh with top/bottom caps. The mesh is rendered with Phong shading (ambient + diffuse + specular) using an overhead light source.
Each saved frame has an adjustable Z slider, so you can freely arrange cross-sections along the extrusion axis.
Inspired by the Teddy sketch-based modeling system (Igarashi et al., SIGGRAPH 1999).