Alternative operator in VEX

[Arthur Spooner]

What is the explicit alternative to this *= for VEX ?

 

 

 

 

[Atom]

Just like most other languages.

 

float my_value *= 2.0;
// Or...
float my_value = my_value * 2.0;

Edited March 19, 2016 by Atom

[Arthur Spooner]

Hrm, maybe then you can elaborate because I have @P *= cr (variable name) and I'm getting the error that it should be explicit not implicit ?

[woodenduck]

Can you post the rest of your code? Where you declare the variable. 

[Arthur Spooner]

matrix3 cr = indent();
vector axis = {0,0,1};
float angle = radians(ch('amount'));
rotate(cr,angle,axis);
@P *= cr;

One other question; functions are written as follows; (word of warning, this code example will have missing code, hoping someone can fill in the voids ?)

surface
noise_surf() {
} 

?

[mestela]

Do you mean ident(), not indent()? Apart from that the code looks ok.

[Arthur Spooner]

Do you mean ident(), not indent()? Apart from that the code looks ok.

Hi, yes, sorry, I meant ident() !

 

My code is not indent, it's ident()

Edited March 20, 2016 by Arthur Spooner

[mestela]

you might have to attach a hip, there's no obvious error in your example code.

[Arthur Spooner]

Hi, I've attached the HIP file; hope it helps.

VEX.Learning.hipnc

[mestela]

Ah, you've used a lowercase @p. It should be @P.

[Arthur Spooner]

Correct me if I'm wrong, shouldn't the Amount slider rotate the cube ?

[mestela]

It does; you've set it to work in degrees though. The default range of the slider is 0-1, so you'll barely percieve 1 degree of rotation.

 

Use the middle-mouse-slider, and try changing it to 45 degrees, it should work.

[Arthur Spooner]

Ahh

 

Sorry, I don't understand the definition of ident() in the VEX functions doc

 

The ident function returns the identity matrix for the given matrix type.

 

[mestela]

Just means 'a matrix that does nothing'. Ie, translate and rotation are all 0 0 0, and scale is  1 1 1.

 

There's probably (read: definitely) a more mathematically pure definition of it, but think of it as making an empty transform, ready for you to do stuff with. In this case, you use it to do the rotation.

 

https://en.wikipedia.org/wiki/Identity_matrix

[Arthur Spooner]

Ah, thank you, once again