Raymarch

A 3d renderer based on raymarching. Uses CUDA to accelerate renders.

Installation

• This program requires cuda to be installed.
• Install python prerequisites with pip install -r requirements.txt. (openCV is only needed to display the frames)

Usage

Artifacts due to gif compression

Checkout main.py for the above animation.

Scene

The scene is the main class that contains all the objects, light sources and the cameras in the scene. Example usage:

scene = Scene(
    cameras={
        "primary": Camera(),
        "secondary": Camera(),
    },
    objects={
        "s": objects.Sphere([0, 0, 0], 1, color=[1, 1, 0]),
        "pl": objects.Plane([1, 0, 0], 4, color=[1, 0, 0]),
        "pr": objects.Plane([-1, 0, 0], 4, color=[0, 1, 0]),
        "pu": objects.Plane([0, -1, 0], 4, color=[0, 0, 1]),
        "pd": objects.Plane([0, 1, 0], 4, color=[0, 1, 1]),
        "pb": objects.Plane([0, 0, -1], 8, color=[1, 0, 1]),
        "l1": objects.PointLight([-1, 2, -2]),
        "l2": objects.PointLight([1, 2, -2]),
    },
)

scene.render() # Returns a dict of np.arrays. An entry for each camera.

Objects

There are three types of objects that can be placed in the scene: spheres, planes and point light sources.

Cameras

Cameras can be initialized with different parameters such as fov, aspect ratio and resolution. Multiple cameras can be within a same scene and scene.render() renders views from all cameras in the scene.

Transformations can be applied to the cameras in order to position them.

from raymarch import Camera
from raymarch.utils import transformations as tf

main = Camera()

# Transformations can be stacked as follows:
t = tf.Transformation()
t = tf.Translate([0, 0, -8])(t)
t = tf.Rotate([3.14159/2, 0, 0])(t)

main.setMatrix(t)

The camera transformation matrix is reset after each time render is called.