Cavalry Charge Generator

Cavalry Charge Generator

Default:

• Model: H3-Base-FL2VA
• Mode: I2VA (reference image first); T2VA fallback supported
• Duration: 7s
• Aspect ratio: 16:9
• Primary Motion Owner: the charging cavalry mass
• Tempo: Energetic — full-speed, real-time; slow motion prohibited for the subject

Reference-First Workflow（参考图路线，推荐）

优选 I2VA：先用图像生成模型产出首帧参考图（见 references/prompt-library.md 的 P-IMG）， 再让 H3 按图动起来——冲锋构图、逆光剪影与焦土质感由图保底，文字只负责速度与镜头。

1. 按 P-IMG 的构图要求生成 16:9 参考图（低机位、前排持矛骑士占中下 1/3、右侧 1/3 尘墙、金色逆光）。
2. 用 P1-I2VA 模板生成 7s 视频；首帧必须与图同构图、同质感。
3. 没有图像生成条件时，降级 P2-T2VA 纯文字模板（结果取决于文字质感，非首选）。

Global Motion Principles

These rules override decorative cinematic language. This Skill's whole identity is speed.

Motion Ownership

The cavalry mass owns all primary motion: the charge, the dust wall, the sand-spray under hooves. The camera chases; dust, light and heat haze accompany — they never replace the charge.

If the horses never visibly gallop at full speed with jarring impacts, the generation fails even if the shot is beautiful.

The Speed Rule

• No slow motion for the subject — ever. Prefer explicit language: The cavalry charges at full gallop, natural real-time speed, hooves hammering the ground.
• At least two acceleration events: the charge building from the dust horizon, and the pass-by burst where the front rank overtakes the camera.
• Exactly one Impact peak (the pass-by / dust-wall swallow at 70–90% of the clip).
• Terrain, armor, and horse anatomy stay physically coherent at speed — no sliding, no float.

Camera

One camera behavior over a locked establish:

1. Locked low establish — the camera holds low and still at ground level while the charge grows in frame (first ~3s); scale is read from the subject, not the lens.
2. One dominant camera behavior — a single ground-level lateral track at saddle height, triggered when the front rank reaches mid-plain, moving slower than the charge so the riders keep growing in frame; locked focus on the front rank through the pass-by peak. No whip-pans, no head-on insert, no vertical moves, no pushes — never run a camera move chain.
3. Grounding kit (anti-float) — gallop renders as glide when the ground has no handles. Always anchor: ① coarse foreground grain streaking past the bottom of the frame pins speed to the ground; ② explicit hoof-landing + sand-kick per stride; ③ handheld camera jolt riding the hoofbeats; ④ camera never floats — ankle/saddle height only; ⑤ long ground shadows / silhouetted dust backlit by the low sun. No beat exists without at least two of these.

The charge reads everything: scale growth, foreground scroll, the pass-by peak. The camera never rises and never sweeps; the locked early beats make the pass-by land.

Texture & Scale Requirements (the epic look)

• Dust as a character: one dust system (sand-spray plumes, rolling dust wall, ember-lit haze) with visible motion.
• Low golden backlight: silhouetted riders, rim-lit helmets, sand glowing in the light.
• Two surface details minimum: armor wear (scratches, rivets), weapon glint, horse muscle ripple, banner cloth tearing.
• Atmosphere stack: background dust wall + mid-ground rolling haze + foreground sand-spray; at least two layers respond to the charge.
• One color temperature (scorched gold / ash-silver / ember night) plus one light accent (torch flicker / moon edge / sun flare).

Prompt Structure

Official three-field layout (see h3-prompt-writing):

integrated_multimodal_description: [Shot 1] <stationary low wide, charge grows from the haze> <scale fills frame, foreground grain scrolls> <one lateral track, slower than the charge, locked focus> <peak 70%: pass-by silhouette> <streams away right, dust settles> — time brackets per beat.

overall_soundscape: <thunder of hooves in waves> + <metal clatter, banner snap> + <low war-horn at the peak>.

non_diegetic_music: <driving percussion and low brass> accelerating to the pass-by, cutting into a low rumble on the wide reset.

Rules:

• One continuous shot — no cuts, no montage, no grid, no text overlays.
• English body copy. Time brackets per beat.
• The Impact peak gets the strongest verb; the pass-by is a single burst, not a repeated trope.
• Never exceed 7s; dust-settle lands in the final second.

Acceptance Checklist

• First second: locked low establish, charge growing in frame from the dust horizon
• Full-gallop real-time speed with visible acceleration; no subject slow motion
• One Impact peak (~70%): front rank thunders past the lens in silhouette
• Low golden backlight: rim-lit riders, glowing sand
• Two or more surface details visible in light
• At least two dust/atmosphere layers respond to the charge
• One color temperature + one light accent
• No cuts; single 16:9 7s clip; physically coherent gallop

Canonical Demo

Runnable now — see references/prompt-library.md P1 (Golden Dust Charge). One more variant (Ember Night Charge) is listed there; swap material slots only. Do not change structure, field order, or labels.