On 26/07/2015 14:19, Orchid Win7 v1 wrote:
> On 26/07/2015 01:47 PM, Orchid Win7 v1 wrote:
>> On 24/07/2015 06:57 PM, scott wrote:
>>> Hmmm odd, I wonder why that is. I just tested it on my work PC (nVidia
>>> Quadro something) and it worked ok.
>>>
>>> Maybe it's something to do with the length of the shader? You could try
>>> reducing the number of samples down to 1 (line 39) and the trace depth
>>> down to 2 or something (line 118), that should make the shader much
>>> shorter.
>>
>> I too was able to get this working by turning down the number of samples
>> and the trace depth.
>
> I presume it looks weird due to the limited trace depth. (?)

Yes it's probably highlighting the limitations in the RNG by only have a 
low trace depth. I uploaded a video of what it looks like here (samples 
40, trace depth 8) - woohoo for compressing noisy video!

https://youtu.be/rXQa5kHspFk

It only works with powers of two because your graphics card only allows 
power of two sized textures, and I'm not doing anything clever to check 
for powered-of-two-ness of the canvas size and creating bigger textures...

Also it's strange after staring at grainy images for a while your 
eye/brain just filters it out and you don't notice it. It's only when 
you then switch to a smooth image you go "wow that's really smooth" :-)

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