trying to use SetObject3DPhysicslinearVelocity()

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shadey

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Posted: 12th Jul 2016 13:31

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I am trying to work out how to move and jump using SetObject3DPhysicslinearVelocity()
The problem is how it works, I cannot both move left and jump, unless there is a way?
So far I am simply doing.

+ Code Snippet

	if getrawkeypressed(KEY_Z)
		movleft=1
	endif
	if getrawkeyreleased(KEY_Z)
		movleft=0
	endif
	if movleft>0
		SetObject3DPhysicslinearVelocity( player, 1, 0, 0, 25) 
	endif
	if getrawkeypressed(KEY_X)
		movright=1
	endif
	if GetRawKeyReleased(KEY_X)
		movright=0
	endif
	if movright>0
		SetObject3DPhysicslinearVelocity( player, -1, 0, 0, 25) 
	endif

But of course it stops moving left if I jump or the other way around!

Hail to the king, baby!

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Mobiius

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Posted: 12th Jul 2016 14:02

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If it's a character, you should use the character controller.

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shadey

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Posted: 12th Jul 2016 15:21

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I really wanted to roll a ball around, so not really a standing/walking character... but i dont think it is possible is it?

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Stab in the Dark software

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Posted: 12th Jul 2016 16:29

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Quote: "I really wanted to roll a ball around, so not really a standing/walking character... but i dont think it is possible is it?"

Yes you can roll a ball around. Your code snippet does not show jumping.
FYI the SetObject3DPhysicslinearVelocity command take direction vectors in world space.

The coffee is lovely dark and deep,and I have code to write before I sleep.

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shadey

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Posted: 12th Jul 2016 16:42 Edited at: 12th Jul 2016 16:45

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ah sorry,i simply have this for jumping:

+ Code Snippet

	if getrawkeypressed(KEY_SPACE)
		SetObject3DPhysicslinearVelocity( player, 0, 1, 0,100)
	endif

So the player object is a sphere and has dynamic physics, how would I roll this around and jump without one effecting the other!

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Van B

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Posted: 12th Jul 2016 16:57

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Sample the current physics velocity first, and apply the X Y and Z velocity after adjusting it for movement and jumping. I have a example...

+ Code Snippet

    sx#=GetObject3DPhysicslinearVelocityX(obj)
    sy#=GetObject3DPhysicslinearVelocityY(obj)
    sz#=GetObject3DPhysicslinearVelocityZ(obj)
    
    
    mvz#=getrawkeystate(38)-getrawkeystate(40)
    mvx#=getrawkeystate(39)-getrawkeystate(37)
    inc sx#,mvx#*10
    inc sz#,mvz#*10
    if mb=1
		inc sy#,10.0
	endif
    spd#=sqrt((sx#*sx#)+(sy#*sy#)+(sz#*sz#))
    if spd#>100.0 then spd#=100.0
	if ready>0 then SetObject3DPhysicslinearVelocity(obj,sx#,sy#,sz#,spd#)

There is no de-bounce on the jump (mb=1), but you probably have your own setup for that, as you'd only want to jump if the ball is touching the ground.

The code is dark and full of errors

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shadey

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Posted: 12th Jul 2016 17:03 Edited at: 12th Jul 2016 17:11

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ok I will look at t thanks,yeh I use it in conjunction with raycasting
hmm.. what is the var mb for?!

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shadey

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Posted: 12th Jul 2016 17:21 Edited at: 12th Jul 2016 17:35

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well,tried incorporating your code:

+ Code Snippet


function player_control()
	sx2#=GetObject3DPhysicslinearVelocityX(player)
	sy2#=GetObject3DPhysicslinearVelocityY(player)
	sz2#=GetObject3DPhysicslinearVelocityZ(player)
	mvz#=getrawkeystate(38)-getrawkeystate(40)
	mvx#=getrawkeystate(39)-getrawkeystate(37)
	inc sx2#,mvx#*10
	inc sz2#,mvz#*10
	//if mb=1
	//    inc sy#,10.0
	//endif
	spd#=sqrt((sx2#*sx2#)+(sy2#*sy2#)+(sz2#*sz2#))
	if spd#>100.0 then spd#=100.0
	if ready>0 then SetObject3DPhysicslinearVelocity(player,sx2#,sy2#,sz2#,spd#)
endfunction

that is the whole function I have, I had to put a digit of 2 to the vars as I was already using the var names. What happens now is that the sphere totally vanishes offscreen, I also didnt know how the ready var was used so set it to 1 as a global :/

I have recently yet again recoded this 3d editor and just trying to make sure it is ok every step of the way:
here is what I had so far with the problem!

I had changed to a sphere after the video was made

But in that I am of course controlling the rogue cube
As you see it is just in the early stages yet again!

Hail to the king, baby!

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Van B

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Posted: 12th Jul 2016 18:15 Edited at: 12th Jul 2016 18:17

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The MB var is the mouse button, that was just copy pasted from an old test thing I did. Also, remove that If ready>0 condition, that's probably causing problems. I used that so manual speed adjustments could be disabled - like you could use that and set it to 0 if the ball is in the air, then it would move with physics alone, then set ready to 1 when on the ground. I've attached the whole test, it's a very simple rope or snake test, spheres following a sphere controlled by the player.

Editor looks good, I like these sorts of games... ever since Spindizzy and Bobby Bearing on the ZX Spectrum, they can get really challenging.

The code is dark and full of errors

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shadey

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Posted: 12th Jul 2016 18:29

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for some reason my sphere totally vanishes, too out the ready condition

So I have this

+ Code Snippet

function player_control()
	sx2#=GetObject3DPhysicslinearVelocityX(player)
	sy2#=GetObject3DPhysicslinearVelocityY(player)
	sz2#=GetObject3DPhysicslinearVelocityZ(player)
	//print (""+str(sz2#))
	 
	mvz#=getrawkeystate(38)-getrawkeystate(40)
	mvx#=getrawkeystate(39)-getrawkeystate(37)
	inc sx2#,mvx#*10
	inc sz2#,mvz#*10
	//if mb=1
	//    inc sy#,10.0
	//endif
	spd#=sqrt((sx2#*sx2#)+(sy2#*sy2#)+(sz2#*sz2#))
	if spd#>100.0 then spd#=100.0

		SetObject3DPhysicslinearVelocity(player,sx2#,sy2#,sz2#,spd#)


endfunction

that is called from this function:

+ Code Snippet

function test_level()
	for n=1 to maxobjects
		if object[n].id>0
			set_physics(object[n].id,object[n].pb,object[n].ps)
		endif
		if object[n].gr=1
			player=object[n].id
		//SetObject3DPhysicsCanSleep(player,0)
		endif
	next n
	create_my_text(2000,308,40,25,0,255,0,"Level Running.. Press E to Exit ",0)
	repeat
		//SetObject3DPhysicslinearVelocity( player, 0, 0, 0, 0 ) 
		if getrawkeypressed(KEY_E)
			quit=1
		endif
player_control()

		Step3DPhysicsWorld()
				
		sync()
	until quit=1
	deletetext(2000)
	quit=0
	clear_physics()
	reset_object_positions()
endfunction

as you see the line I have not indented!

yet immediately the sphere vanishes
if i rem out the line
SetObject3DPhysicslinearVelocity(player,sx2#,sy2#,sz2#,spd#)

it is of course there but cant move!

Hail to the king, baby!

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Van B

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Posted: 12th Jul 2016 19:19

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That is odd. One thing I would try, move the Step3DPhysicsWorld() to beneath the Repeat, so it gets called before player control... I know that doesn't make much sense, surely we should update physics after making the adjustments, then sync - but that's how it is in my test, and I can't remember why... it may well have been similar issues.

The code is dark and full of errors

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shadey

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Posted: 12th Jul 2016 19:36 Edited at: 12th Jul 2016 20:54

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YES! that worked, I knew there was some oddity in some other post I had made, weird. I guess it needs to be called before any adjustments and before the sync()! So simply at the top of the loop indeed.
Thanks for your help.

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shadey

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Posted: 12th Jul 2016 23:36

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Under the documentation for the Step3DPhysicsWorld command it does state:

Call before the Sync() command at the bottom of the loop.

However this aint entirely true!

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AppGameKit Classic Chat / trying to use SetObject3DPhysicslinearVelocity()

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