Task 576: Fix 3D Ship-Planet Collision Appearance

Status: DONE

Description

Human directive phase 31: In the 3D visualization, the spaceship appears to crash

into planets. The simulation results may not be correctly visualized, and there are

discrepancies with the 2D visualization.

Root Cause

Transfer arcs (both static rendering and animated ship path) had endpoints exactly at

planet centers. Since planets have display radii (especially 3× in full-route view),

the ship marker passed through planet spheres during departure/arrival.

Fix

Added offsetFromPlanet() function that displaces arc endpoints away from planet centers

by 1.5× the planet's display radius along the transfer direction. Applied to:

• addTransferArc() — static arc rendering
• loadTimeline() — animated curve building (both orbit-based and pre-defined arcs)

The offset accounts for scene type (full-route uses 3× planet scale, local scenes use 1×).