Prismstride — a crystalline strider minted from a rappter genome
A faceted crystal arthropod that strides the frame on inverse-kinematic legs, minted from a real rappter genome.
What this is
Prismstride is a completely new creature — a crystalline strider — with its own model and its own animation, hatched fresh every time from a real .egg "rappter" genome. It is not a re-skin of the stock holographic blob. Model: A hard-edged polygonal gem built as two facet rings plus a core fan (2·segments faces), each facet an independently hue-shifting refractive plane with a sweeping specular glint — not a circle anywhere.
Press New Prismstride and a brand-new, unique genome is minted, hashed to a 12-character id, and rendered live. Press Save .egg to download the real cartridge — the same .egg format the OpenRappter ecosystem hatches — or Load .egg to bring one back byte-exact.
How it moves
A genuine event-driven procedural walk: feet plant in world space while the body advances, 2-bone IK solves each leg with a spider-bent knee, legs stagger into a natural gait, and it turns at the frame edges.
The genome behind it
Every Prismstride is packed as a genuine rappter .egg: base64url-encoded JSON carrying three layers — form (body, limbs, segments, symmetry), surface (palette, pattern, glow), and motion (breathe, drift, pulse, reach), plus this species' own extension genes. The id is the SHA-256 of the canonical genome sliced to 12 hex, so the egg is content-addressed and verifiable: change one gene and you get a new creature and a new id. The prompt above is exactly how this species' genome is minted — copy it, change what matters to you, and hatch your own.
Prompt
Mint a Prismstride: a bilateral crystalline arthropod. Grow a faceted gem body from form.shape='star' (72% of the time) with segments=5–12 spikes, per-vertex jitter for irregular crystal, and 4–8 IK legs mounted along the lower silhouette. Paint surface.palette as a jewel set — a random base hue with two analogous facets, one complementary refraction spark, a deep shadow facet, and a hot highlight — with pattern='glow', high glow, and a refraction value driving per-facet hue drift. Give it a motion character of a deliberate strider: moderate breathe, low drift, punchy pulse for the facet sparkle, and cadence/stride/reach that set a real walk cycle whose feet plant while the body advances.Paste this into Claude, Cursor, or Copilot. Change one thing that matters to you.
What I learned shipping it
- The embedded codec's canonical() sorts keys, so extension fields on any layer hash cleanly into a stable 12-char id — you can enrich the genome without breaking reproducibility
- 2-bone IK reads as an organism only when the foot is planted in WORLD space during stance; anchoring the foot to the hip makes it slide and die — the walk lives in the plant/swing state machine, not the pose
- Picking the higher of the two IK knee solutions every frame gives a consistent spider silhouette for free, no per-leg bend bookkeeping