22.4.2018 HSV Cone

22.4.2018
Kilian Mehringer
3D Artist

After last weeks render with the rgb cube visualisation. I have the next color space for you this week.
This time its the hsv color space. It shapes a cone with ascending brightness from the bottom to the top, growing saturation from the inside to the outside and changing base color going around.

The HSV Color space represents this 3 Values with H = Hue; S = Saturation and V= Value. Hue is the angle which sets the base color between 0 and 360 deg or in radians. The Saturation is the amount of color added to the brightness its going from 0 to 100 or from 0 to 1. But basicaly its just a percentage value. Value is also in percentage and represents the amount of light in mixed into the color.
And this 3 Values shape a Cylinder. But to the bottom a large volume would be pure black given to its satturation and lightness loss. To avoid this multiple completelely black color values its possible to draw a cone with the same coordinates and cut of all this multiple black values to get one single point of 100% black.

Like the rgb cube last week i wrote a python script to generate this scene. And the basic idea of three for loops generating the single points is the same. This time one for loop from 0 to 100 for value and a second from 0 to 100 aswell for the saturation. The last loop goes from 0 to 360 fro the hue angle of the given color. This values are the 3d coordinates of the single points.
To get the color to get rendered in this visualisation i had to write a function that converts this 3 values to rgb values. Becouse rgb is the color model which can be rendered on a digital display.

HSV is more usefull for computer vision projects or to describe color like we see them.

WIREFRAME 3D MODEL

FINAL SHADED RENDER