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Using Implicit Line Primitives to Create Tree Geometry

cover Cover generated using this program, and rendered in Blender.

This program takes in a volume-less 3d tree skeleton, along with a set of parameters to create an implicit field representing the tree. The extracted iso-surface of the tree mesh will automatically have smoothly blended junctions, and appropriate thickness of branches.

This is done by running a series of implicit poly-line primitives along the skeleton. These primitives collide and blend with one another, thus building up the thickness of the branches lower on the tree.

Building And Running

This Program has only been tested on Linux. imagemagick is required for screenshotting

To Build: create a build folder, and run cmake .. and make while inside the build folder.

To Run: execute ./tree_strands <params.json>. You can find a set of pretested params.json files in resources/trees. If you would like to tweak the options, you can do so directly through a text editor, or using the tree_panel program

Usage

Once the program completes generating the tree you can look at it by moving the camera with the mouse or keyboard.

  • WASD/M-mouse -> Panning the camera
  • IJKL/L-mouse -> Rotating the camera
  • UO/Scroll Wheel -> Zoom in/out
  • R -> Reset Camera

You can export the mesh or take screenshots.

  • \ -> export mesh
  • -> take screenshot

You Can also toggle the various display modes by using the number keys.

  • 1: The tree model
  • 2: The texture strands that add texture to the isosurface
  • 3: The strands that define the implicit line primitives
  • 4: Visualization for strand extension steps
  • 5: The input tree skeleton

There are more controls, I can't be bothered to write them down rn so its a todo

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Model the surface of monumental trees via stacking implicit line primitives.

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