rezvanjoshaghani / lightfieldRenderer

A step by step opengl light filed viewer

Light-Field-Viewer

This is a light field viewer implemented in OpenGL based on Levoy and Hanrahan paper [1] using the light field dataset in [2]. The light field rendering calculation is done with shaders to ensure fast rendering. The code can only handle square image grids. The light field samples are loaded as a texture atlas. All the light fields in the result have 17x17 grid.

[1] Levoy, Marc, and Pat Hanrahan. "Light field rendering." Proceedings of the 23rd annual conference on Computer graphics and interactive techniques. 1996.

[2] Jarabo, Adrian, et al. "How do people edit light fields." ACM Transactions on Graphics (Proc. SIGGRAPH). Vol. 33. No. 4. 2014.

Results

The rendering is done at about 60 FPS. The loading of 4 textures takes about 19 sec. The program is tested on the machine with the following specifications:

• CPU: Intel Xeon 2.8 GHz
• RAM: 64 GB
• GPU: NVIDIA Quadro K620

Dependencies

• IMGUI: library for GUI rendering library
• stb_image: library for loading texture images
• GLM : library for Geometry computation
• GLFW: library for window creation

The control keys

To control the camera position:

• A: move camera to right
• D: move camera to left
• S: move camera Down
• W: move camera Up
• Z: move camera Inward
• X: move camera Outward
• P: print camera information

To control the Image Plane:

• I: move Image Plane Up
• K: move Image Plane Down
• L: move Image Plane Right
• J: move Image Plane Left
• M: move Image Plane Outward
• N: move Image Plane Inward

Light field control Panel

• With the control panel area, you can change the Z position of the camera plane and the focal plane.
• The 0 button shows the camera plane, 1,2,3,4 are different bilinear interpolation, 5 is the quad-linear interpolation
• The buttons on that last row allow for the user to switch to a different light field.

Manifestation

• LightField Atlas Generator :
  • ImageAtlas.py: Combine Stanford dataset images into one image atlas
• res: Contains resources
  • shaders
    • Basic.shader: vertex and fragment shader
  • textures: contains all the textures
• src: OpenGL Code
  • Camera.h: class for handling camera movement and calculation
  • CameraPlane.cpp: Debug code for camera Plane
  • CameraPlane.h
  • IndexBuffer.cpp : Class for handling the index buffer
  • IndexBuffer.h
  • main.cpp: Code entry point
  • Plane.cpp: Class for Image plane generation at different sizes
  • Plane.h
  • Renderer.cpp: Rendering class (currently support OpenGL, support for other renders can be added here such as direct 3D)
  • Renderer.h
  • Shader.cpp: Class for reading and parsing the shaders. The shader should be in one file and be separated by # followed by the shader name.
  • Shader.h
  • Texture.cpp: Class for reading the textures
  • Texture.h
  • VertexArray.cpp: Class for handling the vertex array
  • VertexArray.h
  • VertexBuffer.cpp: Class for handling the vertex buffer
  • VertexBuffer.h
  • VertexBufferLayout.h: Helper class for defining the layout of vertex buffer

• vendor: contains third-party libraries (glm and GLFW not here)
• README.md