Host does not allow CentOS upgrades..is this normal?

I received a notice that our version of WHM/cPanel reaches end of life later this month.

I contacted our host about it and was told that … | Read the rest of https://www.webhostingtalk.com/showthread.php?t=1839541&goto=newpost

artifacts – is it normal to get significant lens flare with a 50mm f/1.8 prime lens?

What you are seeing in the photo is a specific type of lens flare known as ghosting. It is an inverted and reversed reflection of the brightest highlights of the scene. If you were to draw an x and y axis intersecting in the center of the photo, then the bright light on top of the building just left of the vertical axis is reflected the same distance below the horizontal center line and the same distance to the right (in the ball court). The greenish tint in the reflection is caused by the color of the bright light. The light itself looks white because all three color channels are fully saturated at the exposure level used to take the picture. The color of lens coatings designed to minimize reflections is also influencing the color of the reflection. The other bright lights in the scene are also being reflected the same way. Lights in the upper right will show up in the lower left and so on. The five-sided shape of the bokeh around the reflections are due to the number of aperture blades in your lens.

enter image description here

The brightest parts of the scene are most likely bouncing off the IR filter on the front of your sensor and then reflecting back off the back of elements in the lens. If you can also see the reflections through the viewfinder, then the first reflection is occurring in the lens. The EF 50mm f/1.8 II was designed in the film era. Film is less reflective than modern sensor assemblies and so reflections from the camera were less of a concern. Newer lenses have mult-coated optics on both the front and rear surfaces of most or all elements to help combat this.

My Rebel XTi with the EF 18-55mm f/3.5-5.6 II kit lens tended to do this in similar conditions as well.

Parade pic

Some things you can do to reduce such ghosting include:

  • Remove any filters screwed onto the front of your lens. The flat rear surface of the filter is perfect for creating reflections of light bouncing off elements in the lens, or even from the sensor stack itself.
  • Use a lens with better anti-reflective coatings or a camera with a less reflective sensor/filter stack.
  • Try to compose shots so that the brightest points in your scene have bright visual elements at the corresponding point in the cross quadrant to make the reflection less obvious.
  • Make a mask for the front of your lens that blocks half the field of view. Then combine two exposures, one with the mask on the left, the other with the mask on the right (or you might do the same thing with a strong graduated Neutral Density filter). The reflections would still show on the “dark side”, but you would mask them out in post processing when combining the two images.

macos – A “Library”-folder appeared in my Documents folder on Mac, Is that normal?

After starting my computer I have seen a new folder called “Libary” that appeared in my documents folder on macOS. I can’t access it, because, according to the prompt, I don’t have permission, even though I have access as admin.

The folder “Library” can’t be opened because you don’t have permission to see its contents.

According to the information, it has a size of 0 bytes and was created today after starting up.
Is that normal, malware, or something else?

subset – How do you turn a normal intersection to a strict one for arbitrary number of sets?

What is the best way to generalize the following interaction of 3 sets to any number of sets:

intersections(assoc_Association):=Block({
    α0,α1,α2,α3,α1α2,α1α3,α2α3,α1α2α3
},
    {α0,α1,α2,α3,α1α2,α1α3,α2α3,α1α2α3}=Values@assoc;
    KeyMap(Replace({"Total"->"Rest"}),AssociationThread(Keys@assoc->{
        α0-(α1+α2+α3-α1α2-α1α3-α2α3+α1α2α3),
        α1-α1α2-α1α3+α1α2α3,
        α2-α1α2-α2α3+α1α2α3,
        α3-α1α3-α2α3+α1α2α3,
        α1α2-α1α2α3,
        α1α3-α1α2α3,
        α2α3-α1α2α3,
        α1α2α3
    }))
)

The function applied to a particular collection:

intersections@<|"Total"->50,"Boys"->25,"Passed"->30,"Athletic"->28,"Boys"⊓"Passed"->16,"Boys"⊓"Athletic"->18,"Passed"⊓"Athletic"->17,"Boys"⊓"Passed"⊓"Athletic"->15|>

Produces:

<|"Rest" -> 3, "Boys" -> 6, "Passed" -> 12, "Athletic" -> 8, 
 "Boys" ⊓ "Passed" -> 1, 
 "Boys" ⊓ "Athletic" -> 3, 
 "Passed" ⊓ "Athletic" -> 2, 
 "Boys" ⊓ "Passed" ⊓ 
   "Athletic" -> 15|>

Below is a general layout of inputs for a varying number of sets:

enter image description here

moving from digitalocean to normal cpanel host

Hi,

need someone to move my domain and site to normal cpanel hosting account.

please if you can quote for the same.

budget low $XX

Thanks

home screen – Get homescreen icons back to normal size

My dads phone seems to have changed the size of the icons on the homescreen while in his pocket. Is it somehow possible to get this back to normal?

We have so far tried the following things:

  • check display & font size in the accessibility menu is set to default

There is no custom theme/homescreen installed

Large icons on homescreen

java – LibGDX normal vector of a plane

I’m currently developing a 3D game with LibGDX, and I’m a bit stuck, and couldn’t find any definitive answer. I have a plane, part of a bigger g3db file, to which I’d like to get a normal, to calculate which side of that plane the camera currently is. Is there a method built in to LibGDX to achieve this, or should I calculate the normals from the first three vertices of the plane’s mesh?

built in symbols – Dot Product doesn’t behave like normal function

I am trying to slightly modify the Dot function by treating it like a usual function, but soon I notice something weird about it.

Suppose there is a set set = {λ}, and I want to force Dot(a, λ) (having two arguments) to just print out {a, λ}.

set = {λ};

Unprotect(Dot);
Clear(Dot)
Dot(x_, λ_) := Module({}, Print({x, λ})) /; MemberQ(set, λ)
Unprotect(Dot);

(* test *)
Dot(a, λ)
Dot(a, b, λ)

The two tests print out

{a,λ}

and

{b, λ}
{a.b, λ}

respectively.

However, the same code for a different function Dott behave completly differently,

set = {λ};
Dott(x_, λ_) := 
 Module({}, Print({x, λ})) /; MemberQ(set, λ)

(* tests *)
Dott(a, λ)
Dott(a, a, λ)

where the two tests print out {a,λ} and an unevaluated expression Dott(a, a, λ) respectively, and as expected.

I wonder what is going on under the hood (it appears that Dot is trying to exhaust all possible “two-factor product” given any number of dotted factors), and how to properly temper with the Dot product? (my ultimate goal is to adapt it for some non-commutative algebra).

lua – What are the possible drawbacks of using a game engine to make a normal app?

Why don’t I just a make cross-platform (win-linux-mac-android-ios-html) application like an e-mail app for example using a game engine with lua ??
What is the possible drawback of using a game engine to make a normal app ?.

Note that there is no cross-platform framework for lua

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