立体鉴赏名画的方法：深度与法线图生成

名画を立体的に鑑賞する方法
Nano Banana Pro (深度/法線マップ生成)→ WebGL(Three.js)
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【プロンプト】
（法線マップ用）
Generate a surface normal map from the input artwork image.
Output one RGB image where each pixel encodes the surface normal direction in standard tangent-space format:
•R = X direction
•G = Y direction
•B = Z direction
Requirements:
•Maintain the same resolution and aspect ratio as the input image.
•Normal directions must follow the local geometry implied by brush strokes, shading, and contours.
•Do NOT add new artistic elements or repaint the scene.
•Only infer plausible micro-geometry and surface orientation.
•Ensure smooth, consistent normal transitions without noise.
（深度マップ用）
Generate a depth map from the input artwork image.
Output a single grayscale depth map where:
•White = near to the viewer
•Black = far from the viewer
Requirements:
•Maintain the same resolution and aspect ratio as the input image.
•Depth must be smooth, continuous, and physically plausible.
•Infer only geometric depth that could reasonably exist in the original artwork.
•Do NOT add new objects or details.
•Do NOT stylize, repaint, or reinterpret the scene.
•Avoid texture noise; focus solely on depth structure.