OctaneRender® for Blender

The Instance Color texture holds an image, and prepares each image pixel to map to geometric instance IDs. Just as a Lua script or any of the OctaneRender® plugins can generate object instances, these same processes can assign IDs to each of the instances generated, which results in a grid of instance IDs. You can then assign colors to each instance ID via a Texture node (in this case with an image in the Instance Color texture), and match the IDs with pixels of the image, starting at the bottom-left and moving up to the top-right.

Figure 1: Instance color Node

For the example below, there are 10x10 instances, and since a Lua script assigns IDs to each instance, OctaneRender generates 100 IDs. 

Figure 2: A cube and 99 instances 

You can plug an image with 10x10 pixels into the Instance Color texture to match these dimensions. OctaneRender maps each pixel and assigns them to the instance IDs.

Figure 3: 10x10 grid with four colors

Instance Color Parameters

Power - Power/brightness.

Color space - Set image color space.

Legacy gamma - Gamma value. Only used when the color space is set to "Linear sRGB + legacy gamma".

Invert - Invert color.

Linear sRGB invert - Invert image after conversion to the linear sRGB color space, not before.