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Collision detection depends on your needs.

• Bounding boxes are simple and can detect if the x, y edges of each object are not within one another. This is fine for fast moving games and things where you don't necessarily require point precision.
• Distance vectors are also simple and perfect solution for circle collisions. They calculate the difference in distance between two objects according to a radius prescribed with the hypotenuse of distX^2 + distY^2.
• Compound bounding objects are harder to calculate, especially for concave areas on objects of arbitrary shape. There are too many notable and novel approaches to collision detection beyond these to remark on here.

They're also increasingly complex depending on things like variability (if they're deformable objects, if they have particle seams, etc and 2d vs 3d object collision can be vastly different worlds as well. There are tons of articles, but I'll post one with implementation here

Preloading is usually the best thing to do (at least for frequently used assets, such as animation sprites), for these reasons:

• Fetching resources over a network has a latency cost associated with it. When you are doing it during a game that should be running at 30-60 frames per second and responding to user inputs quickly, it may significantly degrade the player's experience.
• If you are loading images on demand, you will need to consider the possibility that the image loading may fail (because of a network failure, for example) and what should be done in such a situation. An advantage of preloading is that you can choose to not let your game start if important assets are not available.

In addition, the code you have posted will not work as you may have expected it to. It will only display frame3.png. This is because JavaScript in the browser is single-threaded: update and the keydown listener will never run concurrently, so the ctx.drawImage call in update will not see frame.src set to frame1.png or frame2.png.

.scn files are SceneKit Scenes files, you can't load directly on SKNode.

You could load the scene file on a SCNScene with:

Do not load the images in the application loop. Loading an image is very time consuming because the image file has to be read and interpreted. Load the images once at the begin of the application:

You can create a list of all sprites in order of z-index/how far front they are, starting with closer sprites.

You cannot use pygame.sprite.groupcollide() here, because the bullets collide with the player that shoots the bullets.
You have to use pygame.sprite.spritecollide(), with one player and the bullets of the opponent. Call it once for each player.

• We can represent simple images as text, store that in a file, and write a C or C# program to read the text file and generate data as .FILL statements.  Here, a simple B&W image for a box might look like this in text:

I figured out a better way to do this :D

rect_x and rect_y can store floating point values. However rect.x and rect.y cannot just store integral values.

Since pygame.Rect is supposed to represent an area on the screen, a pygame.Rect object can only store integral data.

The coordinates for Rect objects are all integers. [...]

The fraction part of the coordinates gets lost when the new position of the object is assigned to the Rect object. If this is done every frame, the position error will accumulate over time.

If you want to store object positions with floating point accuracy, you have to store the location of the object in separate variables respectively attributes and to synchronize the pygame.Rect object. round the coordinates and assign it to the location (e.g. .topleft) of the rectangle: