nnei's physics engine

A small 2D soft physics demo in Python using pygame, featuring a player and pushable blocks with different physics behaviors.

Features

• Player control

  • Move with arrow keys.
  • Smooth acceleration and friction.

• Red blocks (soft)

  • Pushable by the player.
  • Slide with friction and momentum.
  • Collide with each other and static grey blocks.

• Green blocks (super soft)

  • Extremely soft and smooth movement.
  • High momentum transfer and low friction.
  • Pushable by the player and other blocks.
  • Interact with red blocks and each other.

• Grey blocks (static)

  • Act as solid walls.
  • No block or player can pass through.

• Soft collision physics

  • Blocks interact smoothly.
  • Player can push blocks without “flying” forward.
  • Gradual impulse-based collision for natural movement.

Controls

Key	Action
Arrow Up	Move player up
Arrow Down	Move player down
Arrow Left	Move player left
Arrow Right	Move player right

Installation

1. Make sure you have Python 3.8+ installed.
2. Install pygame if not already installed:

pip install pygame

3. Clone or download this repository.

4. Run the game:

python main.py

How it Works

• The player and blocks have velocities.
• Collisions with static blocks are resolved to prevent overlap.
• Soft collisions between movable blocks transfer momentum gradually.
• Green blocks have very low friction → slide smoothly.
• Red blocks behave normally → softer than static blocks, but firmer than green blocks.

Future Improvements

• Add gravity and stacking for blocks.
• Implement sloped surfaces and ramps.
• Add jelly-like deformation for green blocks.
• Sound effects when pushing or colliding.

License

This project is CC0 — free to use, modify, and distribute.

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