| On this page |
VEX examples ¶
To see the VEX implementation of a VEX-based operator:
-
Add the operator to your network.
-
Open the tile menu and choose Type Properties.
Other example VEX source code is available on the web.
Constant Color COP ¶
You could write a “Constant Color COP” function this way:
cop2 constant(vector clr=1; float alpha=1) { R = clr.r; G = clr.g; B = clr.b; A = alpha; }
However, you should use the high-efficiency assign function whenever possible.
cop2 constant(vector clr=1; float alpha=1) { assign(R, G, B, clr); A = alpha; }
User noise functions ¶
This example defines two user functions which generate normalized multiple octaves of Perlin noise.
float myfperlin3d(vector pos; int octaves; float rough) { int i; float nval; vector pp; float result, sum, scale; // Because parameters are passed by reference, we don't really // want to modify the parameters value. Therefore, we copy it // to a temporary variable. pp = pos; scale = 1; sum = 0; result = 0; for (i = 0; i <= octaves; i++) { result += noise(pp); sum += scale; pp *= 2; scale *= rough; } return result / sum; } float myfperlin1d(float pos; int octaves; float rough) { int i; float nval; float pp; float result, sum, scale; // Because parameters are passed by reference, we don't really // want to modify the parameters value. Therefore, we copy it // to a temporary variable. pp = pos; scale = 1; sum = 0; result = 0; for (i = 0; i <= octaves; i++) { result += noise(pp); sum += scale; pp *= 2; scale *= rough; } return result / sum; }
It is possible to use #define macros to encode the contents of the function and simply call the macro to generate vector or other dimensions of noise.