#How do I make a Trajectory Cast?

1 messages · Page 1 of 1 (latest)

fossil star
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its big brain time

crude ravine
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Do you mean a prediction of where movement will go?

fossil star
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pretty much

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but as a cast

crude ravine
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Will the players see it? Or just as a raycast?

fossil star
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just as a raycast

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so its invisible

crude ravine
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Ok. The way I would do it is by getting the velocity direction of the local player, then have a raycast chip start pos at the player, and direction of the velocity. If done right, it will make a straight line of where the player will go if they keep moving in that direction.

fossil star
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yeah but thats not what im trying to do

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raycast is a line

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trajectory cast is curved

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it uses a direction and gravity

crude ravine
fossil star
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uh

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1 sec

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hmm

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well

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let me set an example for

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lets say that i use a raycast, but its modified, so the direction would be (0, 0, 1,) also taking account of gravity, so it would curve down in the xyz vector

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based on the value of the vector

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it goes farther

crude ravine
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I don't think that's possible. In RR, only straight lines of raycast can be done. You would need extremely complicated physics and ray cast systems for that to work.

fossil star
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yeah

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so thats im trying to do

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complicated math and [hysics

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physics

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its possible

crude ravine
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I could imagine it would be done with hundreds of tiny raycast chips.

fossil star
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nah

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its just some math and some other things

crude ravine
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each going 0.01 meters, than doing physics stuff to calculate the next part

fossil star
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you wouldn't need to use multiple raycasts

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like i said, it uses complicated math

crude ravine
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Well, curved raycasting isn't possible.

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So trajectory cast, is also not possible.

fossil star
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i didnt literally mean curve down

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like it would still be a line, but taking account of gravity and pointing down

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so its like a curve

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but you dont see it curve

crude ravine
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So it would point in the direction of where the player would land if they jump/fall?

fossil star
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yeah

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but im thinking i use objects

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they are more smaller and easy to use

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rather tha players

crude ravine
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You could probably do what I said above with velocity, but do some math to take into account of how fast the player is falling to make it more accurate

fossil star
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i tried getting an answer multiple times but i always got something i couldnt understand

dusty portal
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U want to calculate where a projectile will land
Based on what?
Angle and velocity?

fossil star
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yeah

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initial velocity

crude ravine
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Probably because Physics Math Circuits don't exist yet. So it can't calculate gravity or stuff like that.

fossil star
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but you can

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its just really complicated

crude ravine
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That green line.

fossil star
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yeah but that happens while in motion

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I'm thinking as soon as you drop something like a ball it would then do the math and show the hit position

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after its dropped

crude ravine
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Yeah. I'm not sure if you can do that.

fossil star
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bruh

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you can\

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theres videos about this stuff but its always in unity or something

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so i would need some equations

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to do the math easily

crude ravine
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I mean with circuits.

fossil star
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but you can bruh

crude ravine
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I don't know if there are circuits to do that.

fossil star
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its math

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there is a lot of math chips u can use

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for stuff like this

crude ravine
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Then take what you see on unity, try and convert it into RR.

fossil star
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ok bet

final lichen
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What

fossil star
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actually

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the I think i can just subtract the y velocity by the gravitational pull of earth

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9,8 squared

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nvm

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yeah hats the equation im using

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im just figuring out how that works so i can make it in rr

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so initial velocity, gravity, x and y components

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should be simple

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what are u typing bruh

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the good thing about that equation is that it doesnt take account of air resistance

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just like in rr

dusty portal
final lichen
dusty portal
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Everything I said are chips I'm rr

fossil star
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thank you

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you just saved like 3 hours of my life

fossil star
fossil star
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little confused on what that adds up to

dusty portal
fossil star
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oh thanks

fossil star
dusty portal
fossil star
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alr thanks

late flame
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@fossil star there is a much easier way to make a trajectory cast

fossil star
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what is it

late flame
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StartPosition + (StartDirection * (Velocity * Time)) for no-gravity

StartPosition + (StartDirection * (Velocity * Time)) + ((0,-1,0) * (4.805 * Time^2)) with gravity

fossil star
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what is time

late flame
# fossil star what is time

StartPosition = Position the bullet was fired
StartDirection = Direction bullet was fired
Velocity = Speed of bullet in meters per second
Time = Time since fire

fossil star
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it's not a gun

late flame
ocean drift
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is time like a 0-1 thing where 0 is the initial raypoint and 1 is the hitpoint or?

fossil star
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how do I get time since fire

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float variable?

royal loom
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When you fire store the current time get precise seconds as a float variable.

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Then subtract the time get precise seconds from the time you stored to get the time since shot

late flame
late flame
ocean drift
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ah i see, slightly different, never been the best with this type of math stuff lol

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thanks for sending the equation :)

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wait so in this case you'd have to keep checking for a hit while time increases right? what if the bullet goes at such a speed where between the ticks in 30hz it passes through a solid, it wouldn't detect any hit and keep going no?

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assuming it's constantly being checked by a 30hz after fire

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wouldn't you instead want to make a raycast between t && t+x

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and check if that ray hit anything

fossil star
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I'm confused cuz I never used time get precise second b4

ocean drift
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when you fire the projectile you save universal time to some variable, then you subtract that time variable from universal time to get the time since fire

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let's say the time of the universe started 10 seconds ago and we fire

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you save 10

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after 2 seconds the universal time is 12

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so you get 12-10 == 2

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time == 2

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(i know you're not firing a projectile or whatever, just using it as example)

fossil star
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ok

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thanks

late flame
late flame
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we need float precision

ocean drift
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Right :0 mb

fossil star
dusty portal
fossil star
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urs

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yours*

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I want to try both of them to see if one is better

dusty portal
fossil star
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my user is @Sinning

fossil star
dusty portal
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I can't get on but I'll send a picture

fossil star
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ok thanks

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u got it?

dusty portal
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Vector create is the start position

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And the tan and cos input is the angle

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@fossil star

fossil star
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ok

dusty portal
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Vector get magnitude is for the velocity

fossil star
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imma try this

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but some of the circuits aren't wired? some values are 0

dusty portal
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That's for u to input

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Vector get magnitude is the velocity you input

fossil star
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oh so the empty float values are for magnitude?

dusty portal
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Cos and tan inputs are ur angle

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The vector create is just ur start position

fossil star
dusty portal
fossil star
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yeah I know

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vector get magnitude is the velocity

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I'm asking if the empty float values with 0 are for the velocity right?

dusty portal
fossil star
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I'm confused

dusty portal
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This is the angle

fossil star
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so they just stay at 0?

dusty portal
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That's the velocity

fossil star
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ok

fossil star
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it either goes to 0, 0, 0, or it goes somewhere in a wall

dusty portal
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Ya bro try cryptics method its easier to make

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It's 4:23 for me and I need to sleep

fossil star
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ok

dusty portal
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Send a picture of the circuits but I'll not reply until 10 hours later

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✌️

dusty portal
fossil star
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deleted the old one

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having trouble multiplying and adding the vectors and velocity

dusty portal
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Did u try cryptics?