README.md

Model-Modifier

This repository contains my C++17 and OpenGL implementation of a mesh viewer for .obj files, with various algorithms for interacting with the meshes, and various shading techniques.

Features

• Objects
  • Custom .obj parser
  • Triangulation
    • Minimum cost polygon triangulation
• Dynamic object selection
  • Simple geometric objects
  • Complex test objects
  • Automatic rescaling
  • Caching
• Mesh modification algorithms
  • Subdivision surface
    • Catmull-Clark
    • Doo-Sabin
    • Loop
  • Simplification surface
    • QEM
• Shading options
  • Flat shading (Per-face normals)
  • Smooth shading (Per-vertex normals)
  • Mixed shading (Per-Corner normals)
• Shader options
  • Normal shading
  • Gourand shading
  • Phong shading
  • Blinn-Phong shading
  • Gooch shading
  • Cel shading
  • Cook-Torrance shading
• Material controls
  • Ambient
  • Diffuse
  • Specular
  • Shine
• Lighting controls
  • Position
  • Color
  • Multiple lights
• Render modes
  • Mesh polygons
  • Wireframe
  • Point cloud
• Interactivity
  • Rotate model
  • Move camera
  • Rotate camera
• Information
  • Framerate counter
  • Number of polygons in current mesh
• Screenshot to PNG

Image Gallery

Comparison of different shading techniques

Armadillo mesh, Blinn-Phong shader, not smoothened

Armadillo mesh, Cook-Torrance shader, not smoothened

Armadillo mesh, Cel shader, not smoothened

Comparison of different subdivision surface algorithms

Cow mesh, Normal shader, not smoothened

Cow mesh, Normal shader, smoothened 1 time with Catmull-Clark subdivision

Cow mesh, Normal shader, smoothened 1 time with Doo-Sabin subdivision

Cow mesh, Normal shader, smoothened 1 time with Loop subdivision

Dependencies

• GLFW
• GLM
• Dear ImGui

List of 3D Models Used

Here I try to list all sources wherever possible.

Geometric models

Model Name	Source
Crumpled	Keenan Crane
Cube	Me
Double Torus	Geometry Collective
Fandisk	CAD part Pratt & Whitney/Hughes Hoppe
Icosahedron	John Burkardt
Octahedron	John Burkardt
Oloid	Keenan Crane
Sphere	Geometry Collective
Star	Unknown
T-shape	Me
Torus	Geometry Collective
Tubes	Me

Test models

Model Name	Source
Ankylosaurus	Unknown
Armadillo	Stanford
Bob	Keenan Crane
Bunny	Stanford
Cow	Viewpoint Animation Engineering / Sun Microsystems
Cow head	Geometry Collective
Face	Geometry Collective
Gargoyle	Geometry Collective
Kitten	Geometry Collective
Shuttle	John Burkardt
Suzanne	Blender
Teapot	Martin Newell
Teddy	Unknown