A 3D object viewer that runs on a bare-metal Raspberry Pi (no standard libraries).
Created for the Stanford CS107e final project (Winter 2021).
Ari Webb (AriWebb)
Tejas Narayanan (tnarayanan)
- Fast triangle rendering using z-buffers
- Directional lighting
- Loading .obj files from file system
- Moving camera around model using arrow keys
Upcoming
- GPU acceleration
Requires the libpi set of libraries built in CS107e, which includes implementations of standard library methods as well as some extras:
- Strings (
strlen,strlcat,printf) - Memory (
memset,memcpy,malloc) - GPIO
- Graphics (mailbox, framebuffer, drawing)
- Keyboard (PS2 interface)
- Pat Hanrahan's wonderful advice!
- Perspective projection: https://www.scratchapixel.com/lessons/3d-basic-rendering/rendering-3d-scene-overview/perspective-projection
- Camera/view matrices: https://www.3dgep.com/understanding-the-view-matrix/#Look_At_Camera
- Square root calculation method: https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method
- Monkey: Blender default shape (https://www.blender.org/)
- Wolf: https://free3d.com/3d-model/low-poly-wolf-71850.html
- Goat: https://free3d.com/3d-model/low-poly-goat-35241.html
- Cat: https://free3d.com/3d-model/low-poly-cat-46138.html
- Deer: https://free3d.com/3d-model/low-poly-deer-87801.html
- VideoCore IV assembler/example programs: https://github.com/hermanhermitage/videocoreiv
- The
tinyasmmodule (GPU assembler) is from this repository. No additional changes were made.
- The
- Mailbox properties documentation: https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface
- Example of bare metal program that uses mailbox to get Raspberry Pi's serial number: https://github.com/bztsrc/raspi3-tutorial/tree/master/04_mailboxes
- Used this code to understand how to use the mailbox to communicate with the GPU. No code was taken from this repository.
- Example program to peek/poke a memory address using the GPU: https://github.com/ali1234/vcpoke
- Used this code to understand the process of executing a program on the GPU. No code was taken from this repository.
Video demo: https://drive.google.com/file/d/1jsQI91-H1OuIeEY4wmy1Li1u-xQmRkDC/view?usp=sharing
Suzanne, the default Blender monkey:
An orange-colored wolf:
A z-buffer demonstration on the wolf model. Lighter colors are closer to the
camera than darker colors.
A deer:
