My TIPE

Short Presentation

The goal of this project is to render 3D objects on a screen.

I uses raymarching to render primitives (sphere, cylinder and rectangle). I'm able to render light, shadow and mirrors.

How to Install

This simulation uses Processing for UI and GLSL to render. You can download the Processing application here. The file TIPE.pde is the layout and manage UI. The file shader.glsl render the screen with TIPE.pde parameters.

Keyboard actions :

• ESC : exit
• Enter : take a screenshot
• Arrows : move camera
• ZQSD : change orientation
• 1-9 : change the scene
• l and m : change the scene
• : and = : change the value of a parameter depending of the scene
• , : change display mode : Simple raytracing, raytracing with light or raymarching (slow)
• ; : change light mode : ambient light, ambiente and objects light, only objects light
• n : change background : day or night

Features

This is a graphic engine on GPU. The engine use Ray Tracing and Ray Marching.

Features :

• Three primitives : sphere, cylinder and rectangle
  

• Textures for primitives
  

• Reflexion
  

• Blur
  

• Refraction
  

• Light & Shadow
  

• Ray Marching
  Pink color is where the algorithm does not converge
  

• Terrain Generation
  

You can find more pictures in the pictures folder.

Basic functionment

Here is a pseudo-code algorithm explaining the functionment of the raymarching :

def calc_color(R = None):

    if R == None:
        R = Ray( Origin = camera, Direction = pixel)

    Obj = closest_intersection(R, Objects_list)

    if Obj.reflexion:
        R = reflect_ray()
        reflect_color = calc_color(R)

    if Obj.refraction:
        R = refract_ray()
        refract_color = calc_color(R)


    return Obj.color + reflect_color + refract_color

And here is the algorithm for ray marching :

def Ray_Marching():
    P = camera.position
    u = Ray(Origin = camera, Direction = pixel)
    v = normalize(u)

    while True:
        d = SDF(P)
        if d < 0.001: break
        P += v * d

    obj = closest_object(P)

    return obj.color