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how to express a empty point?

pcl_point

asked 2014-04-06 06:05:27 -0500

keygeorge
18 ●4 ●6 ●5

HI there! i created a array containing elements of type pcl::pointxyzrgb ,that is"pcl::pointxyzrgb point[160]"in a for loop,i want to check if the element is empty,i use "if (point[n]!=0)" .but when compiling,system warn that 0 is not the type of pcl::pointxyzrgb.so,i want to ask is there a way to express a empty point in pcl::pointxyzrgb format?how to initialize all the array elements with that empty point?thanks a lot!

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answered 2014-04-06 15:49:17 -0500

jbinney
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A point cannot exactly be "empty" - it always has x,y,z,r,g,b members. You could create a new array without the points you don't want (the new array will be shorter). Or you could set x,y,z to NaN, and check for that in other parts of your code.

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actually i was trying to extract the elements which are not empty from the array,in the for loop,i need to make sure the element is not empty so i can push_back it into another vector.so ,is there a way to initialize the array with empty point?

keygeorge ( 2014-04-06 16:00:18 -0500 )edit

I believe its storing them in a vector, so no. Its a vector of points, so each element is a point (not something else like a null pointer).

jbinney ( 2014-04-06 16:25:57 -0500 )edit

ok,thanks a lot.

keygeorge ( 2014-04-06 16:35:12 -0500 )edit

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Asked: 2014-04-06 06:05:27 -0500

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Last updated: Apr 06 '14

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how to express a empty point?