GetPixelInfoPoint trouble [SOLVED]

On 19/12/2014 at 15:50, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   15,16 
Platform:      Mac OSX  ; 
Language(s) :     C++  ;

I'm using GetPixelInfoPoint in a tool to get information about vertexes of an object that are inside an area.
The information is returned inside a ViewportPixel structure and the vertex is returned in variable i.
But if the x,y coordinates provided in GetPixelInfoPoint don't match with any vertex of the object, the i variable returns 0.
However, the x,y coordinates could match the vertex number 0 of the object.
How can I know if a value of zero in the i variable means that there is no vertex in that coordinate or if it is reporting vertex number 0?

On 20/12/2014 at 06:29, xxxxxxxx wrote:

_<_t_>_ViewportPixel* GetPixelInfoPoint ( Int32 x,
Int32 y
) <_<_t_>_

Retrieves point information at the pixel position ( x , y ).
| [in]| x| An X coordinate within the viewport. Must be  0  <=  x  <  w , where  w  is the width given to Init().

[in] y A Y coordinate within the viewport. Must be  0  <=  y  <  h , where  h  is the height given to Init()_<_t_>_d>

The retrieved point information, or  nullptr  if no information could be retrieved. The ViewportSelect instance owns the pointed viewport pixel..

check against nullptr not 0

On 20/12/2014 at 12:59, xxxxxxxx wrote:

Thank you, Mohamed.
I made it work now :-)