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Bloodstain Pattern Analysis Simulator

Interactive bloodstain pattern analysis lab: fire droplets on a ballistic arc at a wall, watch the impact angle set the stain's ellipse ratio via sin(theta)=width/length, then back-project every stain to reconstruct the 3D area of convergence.

Physics & Mechanics3DModerate60 FPS🔥 Fire 💧 Water

Details

CategoryPhysics & Mechanics

RenderingThree.js · WebGL

DifficultyModerate

Target FPS60

ControlsLaunch elevation slider sets the droplet's initial ballistic angle; speed slider sets initial velocity; droplet-count slider sets how many droplets fire per spray; source-height slider sets the launch point's height; click the floor to place the source and fire; toggle button shows/hides back-projection rays and the computed 3D area-of-convergence marker; clear-stains button resets the analysis.

Three.jsforensicsballisticsbloodstain pattern analysistrigonometryleast squares

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Fire a spray of droplets on real ballistic trajectories at a vertical wall and watch each impact angle carve out an elliptical stain via sin(θ)=width/length, then reverse the process — back-project every stain's tail direction and impact angle to reconstruct the 3D area of convergence and compare it against the true source point.

⚙ Under the hood

Fire ballistic droplets at a wall and see each impact angle set the stain's ellipse ratio via sin(theta)=width/length, then back-project every stain to reconstruct the 3D area of convergence and compare it to the true source point.

Three.jsforensicsballisticsbloodstain pattern analysistrigonometryleast squares

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install