🔷 Before You Click

Preview the consequences before you act.

Before You Click is a fully client-side Fabric mod that shows what may happen before you break a block, place a liquid, or trigger an explosion.

Simply hold Left Alt to display a context-sensitive preview. The simulation is visual only and never modifies the real world.

⛏️ Break Preview

See which blocks may be affected before breaking the targeted block.

The preview supports:

• Unsupported blocks
• Chained support failures
• Sand, gravel, concrete powder, and anvils
• Modded falling blocks
• Doors, beds, and tall plants
• Torches, ladders, buttons, and levers
• Redstone dust, repeaters, and comparators
• Flat, curved, and ascending rails
• Horizontal and vertical scaffolding
• Pointed dripstone
• Waterlogged blocks

Many modded support-dependent blocks can also work automatically through Minecraft's standard placement rules.

💧 Liquid Preview

Preview the likely result before placing water or lava.

The mod can visualize:

• Source placement
• Waterlogging
• Horizontal spreading
• Vertical drops
• Nearby pits and ledges
• Blocked placement
• Water and lava reaction points
• Water evaporation in ultrawarm dimensions
• Fish buckets and other entity buckets

The liquid simulation is intentionally bounded and approximate, allowing it to remain lightweight and responsive.

💥 Explosion Preview

Preview dangerous interactions involving:

• TNT
• Beds in explosive dimensions
• Charged Respawn Anchors
• End Crystals
• TNT chain reactions
• TNT and End Crystal combinations

The explosion preview can display:

• Estimated blast areas
• Explosion wave boundaries
• Detected explosion events
• Chain progression
• Player danger status

Large explosion chains are calculated gradually across multiple client ticks to reduce freezing and sudden frame drops.

🎮 Controls

Hold Left Alt to display the preview.

The key can be changed from Minecraft's Controls menu.

⚙️ Configuration

The configuration file is created automatically at:

config/beforeyouclick.json

Available settings include:

• Individual preview categories
• HUD visibility
• Rendering options
• Refresh rate
• Simulation limits
• Explosion chain limits
• TNT preview without holding an igniter

🖥️ Client-Side Only

Before You Click is completely client-side.

• No server installation required
• No custom network packets
• No world modifications
• Works on vanilla and Fabric servers
• Other players do not need the mod
• Tested with Sodium
• Tested with Iris and shaders

⚠️ Known Limitations

The previews are estimates and may not always match the final result perfectly.

• Complex natural terrain can cause small differences in liquid routing.
• Explosion destruction depends on resistance, shielding, ray exposure, and Minecraft's internal calculations.
• Long TNT chains may display their waves and detected events without showing every affected-block overlay.
• Blocks controlled by scheduled ticks, block entities, or custom server logic may require dedicated compatibility support.
• Piston movement and complete redstone-state simulation are not included in version 1.0.0.

📦 Requirements

• Minecraft 1.21.1
• Fabric Loader
• Fabric API
• Java 21

🔗 Source Code

The project is open source:

GitHub — Before You Click

Think first. Preview the result. Then click.