VEX Wrangles in Houdini - Integer, float, vector and variables
This is a basic intro to wrangles and will cover how to control and understand integer, float and vector values. Will also introduce geometry spread sheets and how to manipulate variables.
- Integer : Whole number - for example: 1, 2 , 3
- Float : Decimal numbers - for example : 1.1, 2.2, 3.3
- Vector : Three values - x y z - for example: { 1, 2, 3 }
- To create our first attribute we will declare a value:
i@atti = 1;
// This means i stands for integer, @atti can be anything, the name you wish the attribute to have.
- Use the geometry spread sheet to analize the input values on the wrangle. (0:04:09:16)
- f@attf = 1.1;
// This means float and the name of the attribute. You can see we will get decimals here ( 0:05:11:22 )
- v@attv = { 1, 2, 3 };
// This will get us the vector values on our geo spread sheet.
Heres is the code:
i@atti = 1;
f@attf = 1.1;
v@attv = { 1, 2, 3 };
// Note this double slash means its a comment so houdini doesent read this line of code. And houdini starts counting from 0, just like computer science.
- Variable;
int vara = 1;
float varb = 1.1;
vector varc = { 1,1,1 };
Examples for manipulating normals:
@N = {1,0,0};
per vector manipulationf:
@N.x = 1;
and you can also do @N.x, @N.y, @N.z
// Houdini understands a set of global attributes that have already been declared as integer, vector or floats. This are set values inside of houdini so we dont need to declare this global attributes.
Example of global attributes:
P = vector = point position
N = vector = normal direction
v = vector = velocity
id = int = uniqu element ID
pscale = float = uniform scale
scale = vector = scale non uniform
