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Normal and depth map generation prompts for Nano Banana Pro
Two English prompts for Nano Banana Pro to generate a tangent-space normal map and a physically plausible depth map from an input artwork image, suitable for 3D-style viewing via WebGL or Three.js.
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. 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.