Model-Modifier

Model-Modifier is my C++17 and OpenGL implementation of an interactive mesh renderer/viewer for .obj files, with various algorithms to apply to 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

Build

Create the solution file by running:

cmake .

open the solution file however you like.