### Absolute value of complex numbers in 3D plot

When I try to make a 3d plot with complex numbers in it, such as this one:

```
plot3d(1+x+abs(i*omega), (x,0,5), (omega,0,5), viewer='tachyon')
```

I get errors saying

```
TypeError: unable to coerce to a real number
```

On another one I got

```
TypeError: Unable to convert 0.0345000000000000*I to float
```

Why is this ~~happening? ~~happening?