More spiders! Looks freaky.
Maybe let spawn some more on pressing spacebar?
And try to let them crawl over eachother when it's getting too crowded hehe (e.g. they can't move anymore).

No i dont use any event functions
The spider just check all the spiders in a definded range and get via -vec_to_angle an angle force away of the spider in their way and simply add the forces to a final force if there is more than one spider.
Additionally they are speeding per spider in range a specific amount down so they won't get to the same position.
One other important thing is that the spiders dont check only if there is a spider in range they check too if the spider is walking towards the other spider AND the other spider towards the spider then the angle will be calculated.
If the spider only walks towards the other, but the other doesnt walk towards the spider the speed will be decreased.

(wow, what weird sentences xD )

hmm i dont know if using a quadtree would improve the collision avoinding but i have an idea how i can add some pathfinding to those creatures or a way how they could walk randomly through a maze without running against walls and without tracing i think i will do that today

EDIT: @ Joozey: Okay i will do that xD

this looks really cool and well done
maybe you could also do a code like if there is an obstacle they fear that they make place for the obstacle if you know what I mean.
looks cool anyway(and scary^^)
Regards
Aztec

quadtree's not to improve quality, but quantity see, each of the 200 spiders are checking their distance from every other spider every frame, right? that's 199 * 200 = 39800 distance checks each frame. with quadtree you could significantly reduce the amount of spiders checked to the few that are in the same grid-square as the spider (or include adjacent squares).

even splitting space into a consistent and regular grid should improve the speed.

julz

thx
I done some pathfinding still without trace:
(Now they are really (in) A-MAZE-(th)-ing )
Click
I added too the joozey key (space) and you can see in the upper right corner the current amount of spiders ^^
I will add soon some spider traps just 4 fun with some splatter effects so you will spend some more time watching them walking on the ground.
But wait only on the ground? Spiders can walk at walls too so i will do that to
While i am working on it have fun with the spiders on the ground

very cool!

I really miss them crawling up the walls though!!

I like spiders ... well done!

Make them crawl up the walls and along the ceiling and let them sit still every now and then (more realistic spider-movement... spiders don't move around all the time, in fact, most of the time they sit still). once you're done with that, let them come down from the ceiling using a thread they create every now and then

@ Manslayer:
I decided to make something with spiders because humans are boring and everything else too xD

@ Germanunkol:
That is exacly what i wanted to do