Hi! 👋

Thank you for choosing to join our team. We’d like to give you a small mini-challenge to confirm skills in Python / TypeScript (your choice). ✅

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🎯 Mini Challenge: Realistic Shadow Generator

Build a mini app that takes:

• 🧍‍♂️ Foreground image (you should cut out the subject)
• 🏫 Background image
• ⭐ Bonus: 🌫️ Depth map (grayscale 0–255)

…and outputs a final composite where the foreground casts a realistic-looking shadow on the background (not just a blur + offset).

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✅ Requirements (must have)

💡 Directional light control

• Light angle (0–360°)
• Light elevation (0–90°)

🖤 Contact shadow

• Dark and sharp near the feet / contact area
• Quickly fades out with distance

🌫️ Soft shadow falloff

• Blur increases as the shadow moves farther away
• Opacity decreases with distance

✂️ Shadow must match the subject silhouette

• No oval shadow
• No fake drop-shadow filter

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⭐ Bonus Mode (advanced)

If a depth map is provided:

• Shadow should bend / warp using the depth map
  (more realistic shadow behavior on uneven surfaces)

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🧰 Deliverables

Please submit:

• composite.png 🖼️ (final output)
• shadow_only.png 🖤 (debug)
• mask_debug.png ✂️ (debug)
• Source code + README 📄

You can build it as:

• 🌐 Web app (TypeScript) OR
• 🐍 Python CLI / PyQt6 UI

Bonus points if you can show you know how to use both.

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📝 What we’re looking for

We don’t need perfect physics — we want something that:

• Looks believable
• Works on different images
• Shows real compositing + shadow math 💪

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⏰ Deadline

2–3 days

🔗 Resources

GitHub repo with foreground and background images:
https://github.com/amcnyusa/Shadow-Files

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Project setup (local)

Python backend (CLI)

pip install -r backend/requirements.txt
python backend/main.py \
  --fg "Shadow-Files-main/25_1107O_11974 PB + 1 - Photo Calendar B_Lamborghini HAS.JPG" \
  --bg "Shadow-Files-main/B_Lamborghini Red.JPG" \
  --mask "path/to/mask.png" \
  --out-dir outputs \
  --angle 45 \
  --elevation 45 \
  --soft-fade 1.0 \
  --blur-ratio 6.0

Notes:

• --mask is optional; if omitted, the foreground alpha channel is used.
• Outputs: outputs/composite.png, outputs/shadow_only.png, outputs/mask_debug.png.

UI (HTML + TypeScript)

pip install -r backend/requirements.txt
python backend/server.py

Open http://localhost:8000.

UI controls:

• Angle and elevation sliders.
• Gradient length (soft-fade) slider.
• Blur ratio slider.
• Save buttons add angle/elevation to filenames.