Explore Vectron in OctaneRender Plugin for Cinema 4D

Unlike OctaneRender Standalone, which can generate a variety of primitives, OctaneRender Plugin for Cinema 4D does not directly create geometric objects. However, the one exception to this is the Octane Vectron object. In this article, iRender will show you how to create a vectron object and apply the vectron primitive.

Vectron in OctaneRender Plugin is a new procedural “uber” primitive which provides infinite procedural scenes, volumes and geometry without using meshes or volumes. Vectron objects have zero-memory footprint and spend zero cost to modify, so they are more efficient than meshes or volumes genterated on CPU host app. The procedural scene generation is live, realtime and 100% on the GPU without any GPU VRAM used. Vectron works with OctaneRender’s built-in OSL (Open Shading Language) support and OSL texture shaders.

You can access many available presets in the Vectron object by going to Live => Objects => Vectron. To create Vectron objects, you can edit a given OSL script in the edit field of the script group. Another way is that you load an external script (in that case, we can not see the code for the Vectron object). 

Next, you select the Vectron object in the Cinema 4D Object Manager, and then choose the Code Group tab in the Attribute manager:

Because there are no polygons in a Vectron object to draw in the Cinema 4D viewport, the actual drawing of the Vectron equation will only take place in Live Viewer or when rendering. Instead, a bounding box and a (usually tiny) sphere in the center of the bounds are generated, with the size of the bounding box being controlled by the Object parameters group on the Code tab. Any portion of a Vectron object that is outside of the bounds will be clipped and not drawn.

Vectron scripts typically generate fast, thus the Live Viewer is ideal for working with them because feedback is practically instantaneous. In some circumstances, a specific script might not display results right away. In these situations, consider modifying the Script Parameter values. The sliders in the Script Parameters group could be difficult to use because the bounds are too large. In such situation, limit a slider’s range by modifying the value of float slidermax in the script to 10, then make necessary adjustments.

An OSL script for a fresh Vectron object has the following lines of code:

A basic sphere is created using this script. With a little more code, as seen in the figure below, you obtain the following outcome:

OctaneRender can render defined SDF surfaces using OSL shaders without the need to convert them to a Mesh first. With OSL, you may assemble networks of set operations like unions, subtractions, intersections, and their smooth variations without needing to mesh them first. You can also update the surfaces with input variables without waiting for any processing.

An illustration of a sphere being removed from a Menger cube is shown above. The c4doctane plugin can do this subtraction since it happens at the formula level. Only Octane Standalone provides object to object booleans.

There are several preset scripts included with the Vectron object:

• • • • • • fractal1.txt
          • glsl_type.h
          • mandelbulb.txt
          • mandelbulb2.osl
          • mandelbub_clay_test
          • menger_sponge_boolean_extract.txt
          • metaball1.txt
          • primitives.txt
          • QuaternionJulia.osl
          • sdf_to_vectron_surface_displacement.txt
          • sphere.osl
          • sphereWithtexture.txt — This script uses a noise texture input. Be sure to add a projection node and set the projection to UVW to XYZ
          • sponge.txt
          • temporal_mandelbuld.txt — In order to see the result of this script, adjust the bounds values located in the Object Parameters group. Large values will be necessary.
          • Vectron Procedural Waves (slow).txt — Generates a plane with a wave texture.
          • vectron_fur_fast.txt
          • vectron_fur_with_motion_blur.txt

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Source: Source: docs.otoy.com