Author: Jiří Zemko

Introduction

The main reason why I’ve choosen to create model of this project is because I’ve done it earlier in 3DsMAX and I wanted to see the different approach with this parametrical modeling. Also it’s interesting artifact from game Dead Space with nice-looking curvature that is good shape for parametrical modeling.

TUTORIAL:

Step 1: Creating guide spiral

First we need create points for the spiral. Best way to do so are the **polar defined points**, cause we use angle and distance to create spiral. We need **range** of angles and range of distances, where we use **graph mapper** because of unusual shape. The more steps for points we use, the more precise then the shape would be, but we don’t need much. Then we just move all the points in to space and interpolate the guide curve.

We will also need second guideline because of these 2 “tentacles” which we will mirror with function **rotate **and **move**** ** to align curves next to each other.

Step 2: Creating base section shape

To create it we need first create the base planes with tool **Prep Frames** on the guide spirals. Here we use for example 16 frames which are best, in my opinion, to capture the original shape. These frames will be the future notches.

Now from every base plane we get also base point from where we shall begin our modeling of section shape, of course with polar points also. First we need to create points, that defines end of curves, then from them we continue to create lines for prependicular notch on the shape and arcs, where we will need vectors to define the curvature. I mostly work with curvature just at a guess.

We also need to graft then all the lines when we join them each in to 1 shape. If we will not do so, the shapes will not be in order and next steps won’t work properly.

Step 3: Scaling and rotating

Now we need to **scale** each of shapes also by graph mapper, that symbolise the cross section of the shape. It’s very similar to the **graph mapper** from the beginning where we defined shape of guideline. When we will be creating range for this, we will need the same count as we have frames (identical number with the component from PrepFrame), but we need it doubled, so we add 1 more defining domain to create additional branch.

Now we **rotate** our shapes and as base plane we use our guide planes, that we got from PrepFrame. There is our advantage from using polar coordinates.

Step 4: Creating notches

First, we need to **split** our list of shapes into 2, 1 tentacle each, so we use number for split the number of frames +1. Same thing we do with the points from center of rotation, that we will use as center of scaling for our notches. For each list of shapes we do the same: First we move them a little bit (I used 0,2 units on z) and then **scale** both of shapes (I used factor of scaling 0,8) to create the wireframe version of the notch.

Step 5: Loft

For the notches we can use simply tool **Loft**, but first we need to graft them (so they will not to try create 1 big shape). The rest of the surface we need to shift list of the bigger shapes so it will create surface between the notches and not over them. Also good is to use Boundaries on bigger shapes to fill the space between notches.

Step 6: Array and coloring

Now we can color the single marker and try to make it closest to origin (different color for notches and for rest of surface), or we can continue and try to make array of markers with different colors.

We simply create array of markers and using guide **rectangle** (I used lenght and width about 20 units between). Then we create attractor points for characterising the values of RGB colors. I choosed to create them evenly spreaded into whole array. Again using polar points to easily adjust it by number of cells that define whole array. Now we collect values of **distances** from each (tool **BrepClosestPoint**) of the shape to each of attractors, then we must remap them and we get the values for **RGB**. I only did it for array 4×4, because more of shapes were too much for my laptop.

In the end we can now play with number of notches, number of markers in array or try different guiding curves but in the beginning.

Script: JiriZemko