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Getting the unique values in an integer array
Here’s an ICE tree that removes all duplicate values from an array of integers, leaving you with an array of unique integer values:
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ICE powers of 10 array
In ICE, how would you generate an array like [1, 10, 100, 1000, 10000, 100000, ...] without using a Repeat node ? It might help to look at it this way: 1 10 100 1000 10000 100000 Once you recognize...
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Boolean operations on ICE arrays
While it is true that non-zero values are considered True, this applies only to input values. ICE nodes that return a boolean value will always return either 1 or 0. Based on this, you can do an...
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Using Generate Sample Set to avoid the Repeat node
Hat tip to Oleg who posted this tip on the mailing list some time ago. The basic ideas is that instead of looping over an array with a Repeat with Counter, you use Generate Sample Set to get a data...
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Given vertex index get point position
Three different ways to get the point position coordinates for a given vertex index. In terms of getting to a per-object context, Point Index to Location seemed the most straightforward.
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ICE: adding consecutive elements in an array
I was hoping to do something more complicated, but I ran out of time… Here’s the exercise: Take an array and build a new array by adding consecutive elements in the original array. For example, given...
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ICE: Removing duplicates from arrays
Here’s an ICE tree that removes all duplicate elements from an array. It uses Generate Sample Set, so there’s no repeat nodes. But it relies on the fact that you can feed in an array of indices into...
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ICE: Finding the array elements that occur the most frequently
Another example usage of Generate Sample Set instead of Repeat. This time, the problem is to find the array element with the most occurrences. This seems kinda long winded (it’s a three-step process),...
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ICE: Doing an element-wise stretch on an array
I’m not sure “element-wise stretch” is the right terminology, but what I mean is suppose you want to build a new array by repeating the original elements N times. For example, suppose you have the...
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ICE element-wise addition of two arrays of different sizes
For example, given the arrays [1,2] and [1,2,3,4], produce this array: [2,3,4,5,3,4,5,6]. In Python, this would look like this: a = [1,2] b = [1,2,3,4] c = [] for x in a: for y in b: c.append( x + y )...
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ICE: Building an array from an fcurve
Suppose you have an animated scalar value, and you want to store its values as you play through a simulation. And suppose you also want to keep a running total of all the values up to the current...
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More fun with arrays
Here’s a recent array question from the mailing list: How do you build an array that looks like this? [0, 0, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, ...] ? I didn’t check the other answers yet, because that...
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Context matters: Get Set Size versus Get Array Size
PointNeighbors is a set of per-point arrays, so when you feed that into Get Array Size, you get a set of per-point integers (the number of neighbors for each point). Get Set Size, in contrast, will...
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Getting the neighbors of a specific point
There’s surely a better way, but this was a good little exercise in using ICE array nodes.
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Getting the neighbors of a specific point, part 2
As I wrote yesterday, there surely was a better way to get the neighbors of a specific point than messing around with a bunch of arrays. Here it is. Hat tip to Eric Thivierge
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Scripting: Getting the StrandPosition arrays
StrandPosition is an array of arrays: one array of positions for each strand. Here’s a Python snippet: from win32com.client import constants xsi = Application def dispFix( badDispatch ): import...
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ICE: Removing every Nth element from an array
The interesting part (to me) is generating the sequence of indices. It’s too bad I have to create a second array to do it, but I keep the size down to an Nth of the original.
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Using geometry queries to find and update points
Here’s a couple of examples of how to use a geometry query to modify certain points in a point cloud. The geometry queries return locations, and you can’t plug locations into Set Data nodes, so you...
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Sorting points with Sort Array with Value
Here’s a couple of examples to illustrate how to use Sort Array with Key. This ICE tree sorts points by their Y position. And this tree sorts points by their brightness.
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ICE: Summing up array elements by group
Given an array like [0, 3, 7, 22, 6, 71, 1, 0, 9] how do you sum up the first group of three elements (0+3+7), the second group of three elements (22+6+71), the third group (1+0+9), and so on and so...
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