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What does glLoadIdentity() do in OpenGL?
...
glMatrixMode(GL_PROJECTION) : deals with the matrices used by perspective transformation or orthogonal transformation.
glMatrixMode(GL_MODELVIEW) : deals with matrices used by model-view transformation. That is, to transform your object (aka model) to the view coordinate space (or camera space)....
Why are quaternions used for rotations?
...a huge impact.
Another nice side effect of using quaternions is, that any transformation inherently is orthonormal. With translation matrices one must re-orthonormalize every couple of animation steps, due to numerical round-off errors.
...
Positioning element at center of screen
...
With transforms being more ubiquitously supported these days, you can do this without knowing the width/height of the popup
.popup {
position: fixed;
top: 50%;
left: 50%;
-webkit-transform: translate(-50%, -50%);
...
In Ruby, is there an Array method that combines 'select' and 'map'?
... .select { |line| line.property == requirement }
.map { |line| transforming_method(line) }
.uniq
.sort
end
The .lazy method returns a lazy enumerator. Calling .select or .map on a lazy enumerator returns another lazy enumerator. Only once you call .uniq does it actually...
Stream vs Views vs Iterators
...n in itself. What makes it special in Scala is the fact that you can apply transformation such as map and filter and simply get a new Iterator which will only apply these transformations when you ask for the next element.
Scala used to provide iterators which could be reset, but that is very hard t...
Get the Row(s) which have the max count in groups using groupby
... of the original DF you can do:
In [3]: idx = df.groupby(['Mt'])['count'].transform(max) == df['count']
In [4]: df[idx]
Out[4]:
Sp Mt Value count
0 MM1 S1 a 3
3 MM2 S3 mk 8
4 MM2 S4 bg 10
8 MM4 S2 uyi 7
Note that if you have multiple max values per gr...
Concatenate strings in Less
...
For those string-like unit values like 45deg in transform: rotate(45deg) use the unit(value, suffix) function.
Example:
// Mixin
.rotate(@deg) {
@rotation: unit(@deg, deg);
-ms-transform: rotate(@rotation);
transform: rotate(@rotation);
}
// Usage
.rotate(45);
/...
Split column at delimiter in data frame [duplicate]
...('a|b','b|c','x|y'))
> df
ID FOO
1 11 a|b
2 12 b|c
3 13 x|y
> df = transform(df, FOO = colsplit(FOO, split = "\\|", names = c('a', 'b')))
> df
ID FOO.a FOO.b
1 11 a b
2 12 b c
3 13 x y
s...
Image fingerprint to compare similarity of many images
...to account.
If you need extremely robust fingerprinting, such that affine transformations (scaling, rotation, translation, flipping) are accounted for, you can use a Radon transformation on the image source to produce a normative mapping of the image data - store this with each image and then compa...
Monad in plain English? (For the OOP programmer with no FP background)
...e is a "bind" operation that takes a monadic value and a function that can transform the value, and returns a new monadic value. Bind is the key operation that defines the semantics of the monad. It lets us transform operations on the unamplified type into operations on the amplified type, that obey...