Le 18-03-27 à 16:33, Stephen a écrit :
> On 27/03/2018 20:04, Alain wrote:
>> Le 18-03-27 à 05:28, Sven Littkowski a écrit :
>>> Thanks. I heard about that function, but have problems to handle it.
>>>
>>> But never mind, I have all coordinates of the entire scene in my mind. I
>>> find it difficult to learn to work with so-called WYSIWYG editors, I
>>> hand-code everything. :-)
>>>
>>> ---
>>> Diese E-Mail wurde von AVG auf Viren geprüft.
>>> http://www.avg.com
>>>
>>
>> You mostly need to remenber that trace(object, start, direction) use a 
>> start location and a direction. If you change the last value, you'll 
>> trace in different directions.
>>
>> trace(Deck, <PosX, 1000, PosZ>, -y)
> 
> 
> Even I can use it. ;-)
> 
> Use PosX, PosZ to describe a grid with a loop. And check that
>    (vlength (Norm)!=0) and do some stuff
> 
> 
> Hmm! I had an extra variable:
> 
> #declare Inter = trace (Trace_object_,< Pos_x, Pos_y, Pos_z >, z, Norm);
> 
> #if (vlength (Norm)!=0)
> 
> 
> Then do some stuff.
> 
> #end
> 
> 
> Alain probably knows and uses a more efficient way of coding it than I 
> do/can.
> 
> 

If you can be reasonably sure that all your start points are over the 
target object, then, you can omit the normal parameter.
But, yes, taking the normal into account is normally preferable.

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