For things like movement, you should not check for events (like KEYDOWN or KEYUP), but check every iteration of your mainloop if your movement keys are pressed (using get_pressed). In your code, you check the pressed keys only if there’s also a KEYDOWN event. There are also some other things to consider: You should seperate … Read more
Have played with this for fun a bit and here the result: Algorithm: process each disc set speed as constant*destination_vector multiplicative constant a and limit the speed to constant v afterwards test if new iterated position does not conflict any other disc if it does rotate the speed in one direction by some angle step … Read more
This appears to be an issue with collision detection. Most have found solutions by using the didBeginContact and reapplying the force at an opposite direction. Note he says didMoveToView but corrects himself in a later comment to didBeginContact. See comments at the bottom of the Ray Wenderlich tutorial here I have a fix for the … Read more
I am looking for the exact same thing, as it turn out I have done a small web app for this purpose. SKPhysicsBody Path Generator as action in example: Update 2015-02-13: script <!DOCTYPE html> <html> <head> <meta charset=”UTF-8″> <title>SpriteKit Tools – SKPhysicsBody Path Generator</title> <link rel=”stylesheet” href=”https://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css”> <style> /* disable responsive */ .container { max-width: … Read more
Your quadtree structure isn’t optimal. You’re right to store 4 subtrees per node, but actual objects should only be stored inside the leaves, not inner nodes. Therefore the collection holding the actual objects needs to be moved to the leaves. Let’s have a look at the implementation of the operations: Insert an object into the … Read more
I had a lot of memory problems with Sprite Kit, and I used a tech support ticket to get info, and it may relate here. I was asking whether starting a new SKScene would totally release all the memory the previous one used. I found out this: The underlying memory allocated by +textureWithImageNamed: may or … Read more
Unfortunately there are different conventions on how to define these things (and roll, pitch, yaw are not quite the same as Euler angles), so you’ll have to be careful. If we define pitch=0 as horizontal (z=0) and yaw as counter-clockwise from the x axis, then the direction vector will be x = cos(yaw)*cos(pitch) y = … Read more
It flows from the definition of a normal. Suppose you have the normal, N, and a vector, V, a tangent vector at the same position on the object as the normal. Then by definition N·V = 0. Tangent vectors run in the same direction as the surface of an object. So if your surface is … Read more
I did program sol system simulation too so here are mine insights: rendering I use OpenGL with 1:1 scaling. All units are in SI so [m,s,kg,…]. The problem gets started with Z-buffer. The usual Z-buffer bit wide is 16/24/32 bit which is nowhere near what you need. I am rendering from 0.1m up to 1000 … Read more
I think your explanation it is hard to understand. Your are comparing an object with a number after you incremented the type, so conditions won’t met function checkClick (mouseEvent) { for (i = 0; i < all_rails.length; i++) { if (mouse_x < all_rails[i].x + 32 && mouse_x > all_rails[i].x && mouse_y > all_rails[i].y && mouse_y … Read more