Domain: Natural Science — Physics
Target concept: The surface of the thermochromic coating exhibits different radiative heating rates.

Video generation prompt: Two identical metal plates, one coated with a matte black thermochromic coating and the other with a glossy metallic thermochromic coating, are placed side by side on an insulating stand and continuously recorded under an infrared heating lamp until the metal plates undergo color change due to heating.

Evaluation guide:
(i) Target concept: Differential radiative heating rates due to surface emissivity/absorptivity differences in thermochromic coatings.
Minimum mechanism: Matte black surfaces have higher infrared absorptivity, so they warm up faster and reach their thermochromic transition temperature sooner; glossy metallic surfaces reflect more infrared, so they warm up more slowly and transition later; the insulating stand prevents heat from draining away through conduction; the infrared lamp supplies steady, equal radiant heating to both plates from the very start of the recording.
(ii)Storyline: Frame 1–2: Static wide shot showing both plates side-by-side on the stand, with the infrared lamp already on and evenly illuminating both plates. Frame 3–6: The matte black plate begins a whole-surface color change (e.g., black to violet), while keeping its matte texture. Frame 7–10: The glossy metallic plate begins its own whole-surface color change (e.g., silver-gray to blue), later than the matte plate, while keeping its glossy highlights. Throughout: fixed viewpoint, no occlusion, no change in the lamp's brightness, no plate movement; the only visible change is each coating's color transition, anchored to coating type and temporal order.

Manual:
Experimental Procedure
1. Place two identical bare metal plates side-by-side on an insulating stand.
2. Coat one plate uniformly with matte black thermochromic material; coat the other uniformly with glossy metallic thermochromic material.
3. Position an infrared heating lamp directly above both plates, equidistant and centered, and switch it on.
4. Once the lamp is at full brightness, begin recording; continue until both plates undergo a visible color change.
Observation of Experimental Phenomena
Matte black-coated plate changes color first; glossy metallic-coated plate changes color later; both transitions are sudden across the whole coated surface and preserve original surface finish cues.
Summary of Experimental Principles
The matte black coating absorbs infrared radiation more efficiently than the glossy metallic coating, resulting in faster radiative heating and earlier thermochromic response.

Prompt Grounding rubric:
level_1: Two metal plates are not both visible at the start; or only one plate appears; or neither plate shows a thermochromic coating; or no insulating stand is present; or no infrared lamp appears in the opening shot; or the two plates are not arranged side by side; or the opening shot shows unrelated objects instead of this setup.
level_2: Two plates sit side by side at the start, but at least one of the following is wrong in the opening shot: no insulating stand beneath them, no infrared lamp visible, one plate lacking a distinguishable coating, or both plates sharing the same coating type (both matte or both glossy) instead of one of each.
level_3: In the opening shot, two plates of matching size rest side by side on an insulating stand with an infrared lamp visible and already illuminating them; one plate clearly has a matte black surface and the other a glossy metallic surface; all required elements (two differently coated plates, stand, lamp) are present and correctly identified at the start.
level_4: All conditions for score 3 are met, and in the opening shot both plates sit flat and level on the stand with no tilt; the lamp is positioned evenly over both plates rather than favoring one side; no extraneous object blocks the view of either plate at the start.
level_5: All conditions for score 4 are met, and the opening camera framing is front-facing and centered on the pair, with both plates occupying comparable visual area and no perspective distortion making one plate look bigger or closer than the other; the matte and glossy finishes are clearly distinguishable from each other by their surface sheen alone in this opening shot.

Scientific and Causal Correctness rubric:
level_1: Neither plate ever changes color; or only one plate changes color while the other never does; or both plates change color at the same time with no visible lag between them; or a color change starts before the lamp is shown illuminating the plates; or a color shift looks like fading or bleaching rather than a clear thermochromic change.
level_2: Both plates eventually change color, but at visually indistinguishable times with no lag between the matte and glossy plate; or one plate changes color while the other shows no response at all; or the glossy metallic plate changes color before or faster than the matte black plate, reversing the expected order.
level_3: Both plates change color, but the matte black plate visibly begins its transition before the glossy metallic plate does; each plate's color shift affects its whole coated surface at once, rather than creeping gradually across only part of it; the change stays confined to the coated surface rather than spreading onto any bare metal edge.
level_4: All conditions for score 3 are met, and once each plate finishes changing, it does not revert or flicker back toward its original color; each plate keeps its original surface finish cue (the matte plate still looks matte and the glossy plate still looks glossy) even after its color has changed.
level_5: All conditions for score 4 are met, and the matte black plate's transition is clearly finished, or clearly well underway, before the glossy metallic plate's transition visibly begins, with no frame showing both plates mid-transition at the same moment; both plates reach a stable new color by the end of the clip with no lingering patchiness or two-tone look.

Spatiotemporal Consistency rubric:
level_1: Either plate suddenly jumps to a new position or vanishes and reappears; the stand or lamp disappears partway through the clip; the room lighting jumps from one brightness level to another within a single frame with no visible transition; either plate visibly warps, bends, or cracks in a way real metal plates would not.
level_2: One or more frames show the plates' shadows suddenly pointing a different direction than before; a hand or object briefly blocks one plate and then vanishes rather than visibly moving away; a plate's edge briefly blurs or loses definition for several frames in a row; the lamp flickers off and back on during the clip.
level_3: Both plates stay in the same side-by-side position on the stand for the entire clip, with no sudden jumps, warping, or breakage; the lamp's brightness and light direction stay the same throughout; the shadows the plates cast stay fixed in shape and location relative to the plates; there are no frame drops or stutters that interrupt the flow of the video.
level_4: All conditions for score 3 are met, and each plate's surface finish stays visually consistent with its type (the matte plate never suddenly looks shiny and the glossy plate never suddenly looks dull) apart from the expected color change; neither plate jitters or shifts its alignment relative to the stand at any point.
level_5: All conditions for score 4 are met, and the camera viewpoint never zooms, pans, tilts, or rotates for the entire clip; both plates and the stand keep the same relative size and position on screen from start to finish; if any subtle shimmer from heated air appears above the plates, it affects both plates similarly rather than only one.