Why my output array is always 0

[Tobiaswei]

As title, I just copy the code and run it.

[orzzzjq]

We didn't write any output funtions, please paste your code here. As a recommand, please see pba-plus-2D/main.cpp line 145-148.

[Tobiaswei]

So does the outputVoronoi array corresponding to "Output: 2D texture. Each pixel is represented as two "short" integer " refering to its nearest site. I assumed the outputVoronoi should contain the nearest point coordinates respect to the random generate 2D texture. Thanks for your reply!

[orzzzjq]

Yes... outputVoronoi stores the coordinate of the nearest point generated in generateRandomPoints() for each pixel. So do u have any problems now?

[Tobiaswei]

outputVoronoi seems to be all zero. And it seems not jump into the kernel function since I cannot printout from any kernel function. Do you have any ideas whats wrong with it ? I compile it with nvcc pba/pba2DHost.cu main.cpp -o dt.o

[orzzzjq]

I can get the correct answer with nvcc main.cpp pba/pba2DHost.cu -o dt.

[Tobiaswei]

It sounds wired... here are the parameters I used int fboSize = 30; int nVertices = 50; output result.txt.txt Do you have any suggestions?

[orzzzjq]

fboSize = 30 is too small for PBA+, the texture size should be multiple of 64. You can see main.cpp line 53-55 for more details. If u want to construct DT for a small texture, you can simply put it into a larger square with a size of multiple of 64. This is for a better performance of CUDA.

[Tobiaswei]

Yes, I reset the fboSize = 2048 nVertices = 100 and it works correctly, giving the error 0. However, when I reset the fboSize = 1024 nVertices = 100 it gives a really large error value 1043722 Is there anything I have to change?

[orzzzjq]

I guess you didn't set the parameters phase1Band, phase2Band, phase3Band correctly. You can see main.cpp line 53-55 for the constraints of the parameters. Or you can take the suggested parameters on our website (Table 2. Appropriate parameters of PBA+ on different GPUs).

[Tobiaswei]

Thanks! Really appreciate!