PitchSim

PitchSim visualizes baseball pitch trajectories through physics simulation.
Without throwing a single ball, just adjust velocity, spin rate, spin axis, and gyro spin to see how 15 pitch types move in real time — from a 4-seam fastball to a knuckleball.

[Who It's For]
· Fans who want to understand why Darvish's slider breaks the way it does
· Pitchers and coaches who want to learn spin axis and gyro effects without a Rapsodo
· Physics enthusiasts who want to experience the Magnus effect and Seam-Shifted Wake firsthand

[Features]
■ 15 Pitch Presets
4-Seam Fastball, 2-Seam Fastball, Sinker, Changeup, Curveball, Slider, Gyro Slider, Cutter, Sweeper, Shoot, Splitter, Forkball, Knuckleball, SSW Demo ↘, SSW Demo ↖

■ 3D View (4 Angles)
Catcher, Right-Hand Batter, Left-Hand Batter, and Orbit views.
Freely rotate in Orbit mode to see the full 3D trajectory.

■ Parameter Control
Adjust velocity, spin rate, spin axis, and gyro spin with sliders.
Changes reflect instantly in the 3D view.

■ Freeze at Zone
Pause the ball exactly as it reaches the front of the strike zone.
Compare ABS (Automated Ball-Strike) and rulebook judgements side by side.

■ Pitch Comparison (up to 8)
Overlay multiple pitches to compare trajectories visually.
Great for understanding pitch sequencing and tunneling.

■ Stats Panel
Displays horizontal break, vertical break (IVB), exit velocity, and hop component — all in Statcast-compatible units (cm / inches).

■ 2D Views
Switch between pitcher's-eye and top-down views for horizontal break analysis.

[Physics Model]
Based on Alan Nathan's baseball physics model (University of Illinois).
Implements Magnus force, aerodynamic drag, gyro spin effects, and seam drag.
v2.0 adds SSW (Seam-Shifted Wake) — a physics-based model of the asymmetric wake caused by seam orientation, improving accuracy for sliders, cutters, sinkers, and other seam-sensitive pitches.
Calibrated against Statcast data.

[Free vs. Full Access]
Free: 6 pitches (Fastball, Curveball, Slider, SSW Demo ↘, SSW Demo ↖, Knuckleball), Catcher view only
PitchSim First (one-time purchase): All 15 pitches, 4 views, Freeze, Pitch Comparison, Stats, and SSW auto-optimization

Design pitches. Understand the physics. No ball required.