Cutting a Black Obsidian in slow motion: What You Need to Know
The honest detail buried in this prompt: it’s not actually asking for obsidian, it’s asking for a prop “made of layered plastic with a soft, rubbery outer skin.” That’s a deliberate choice worth understanding — real obsidian is glass-hard and wouldn’t compress or stretch before splitting the way this description asks for. By naming the material as a plastic prop rather than the real mineral, the prompt gets physically plausible compress-then-split behavior instead of asking the model to fake how obsidian actually fractures (which is a sharp, brittle conchoidal break, nothing like this).
It’s a useful trick generally: if the visual behavior you want doesn’t match how your subject material really behaves, describe the material that does behave that way, and let the title/framing do the “obsidian” branding instead.
The prompt
Extreme macro close-up, slight 3/4 top angle. Gentle, very slow forward push-in (2–3 cm) that settles into a near-locked shot by mid-clip. 100mm macro lens, f/2.8 shallow depth of field; focus tracks the blade edge and the opening cut line. 4K realism, 60fps for smooth slow motion. Well-groomed human hands with clean, short nails and natural skin texture. Satin-finish stainless-steel kitchen knife, razor-straight edge. “Obsidian” prop made of layered plastic with a soft, rubbery outer skin and darker layered core, resting on a spotless light marble countertop. One continuous, slow, controlled straight slice from top to bottom. The blade presses in; the soft outer skin compresses and stretches before splitting cleanly. The cut gradually opens, exposing intricate crystalline-like internal structures and layered striations; micro-fragments and fine dust shift and settle along the seam as the knife continues downward. Minimal clean countertop scene, no clutter. Subtle smudgeless reflections on marble; tiny particulate gathers near the cut. Soft diffused lighting that removes harsh shadows, slightly desaturated cinematic grade, calm intimate ASMR atmosphere. Ultra close-mic ASMR: soft muted metal-on-material scrape, faint granular shifting and tiny crackle as layers separate, no background noise, no music. NO SUBTITLES
