Why Procedural Terrain? Large area exploration Small details - - PowerPoint PPT Presentation

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Why Procedural Terrain? Large area exploration Small details - - PowerPoint PPT Presentation

Dec 27, 2022 429 likes •796 views

Why Procedural Terrain? Large area exploration Small details interest Endless worlds (e.g. Minecraft) Time saving for artists Procedural generation Artistic control Overview 1. Polygonal Map: initial shape 2.

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Why Procedural Terrain?

  • Large area  exploration
  • Small details  interest
  • Endless worlds (e.g. Minecraft)
  • Time saving for artists

Procedural generation Artistic control

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Overview

  • 1. Polygonal Map: initial shape
  • 2. Terrain Features: tune the terrain
  • 3. Water Erosion: increase realism
  • 4. Vegetation: add life
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Perlin Noise

The programmer’s friend

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Fractal noise – sum of perlin noise

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Step 1: : Polygonal Map

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Voronoi diagram

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Island shape

Perlin noise + distance to the center

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Elevation, Temperature, Moisture

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Elevation, Temperature, Moisture

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Elevation, Temperature, Moisture

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Elevation, Temperature, Moisture

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Create height map

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Step 2: : Terrain Features

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Feature Curves

Interpolation between Control Points

  • Elevation
  • Plateau size
  • Slope size
  • Slope angle
  • Smoothing influence
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Hills

  • nly elevation and smoothing, no slope
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Hills

  • nly elevation and smoothing, no slope
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Ridge lines

45° slope

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Ridge lines

45° slope

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Cliffs

90° slope at one side, long smoothing at the other side

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Cliffs

90° slope at one side, long smoothing at the other side

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Step 3: : Hydraulic Erosion

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Pipe model

Move water from one cell to another when the height is lower

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Erosion

Water erodes sediment on steep slopes Sediment is deposited on flat areas

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Step 4: : Vegetation

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Assign biomes

  • Texture
  • Grass density
  • Tree types
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Grass

quads with texture

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Grass

quads with texture

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Grass

quads with texture

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Trees

  • Define trees recursively
  • Specify properties for every layer:
  • Radius, scaling
  • Curvature
  • Branching, splitting
  • Textures
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Problem: too many polygons Use impostors for distant rendering

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Thanks for your attention