Change Camera Height in a third person game

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LeGugusse

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Joined: 15th Feb 2007

Location: Paris - France

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Posted: 9th Dec 2020 21:17

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Hello,

I'm working on a third person topdown view game and I would like to change dynamically the camera zoom (or camera height) during the game.

+ Code Snippet

I tried to use this script: 

function camera_control_init(e)
end
local mod = math.modf
function camera_control_main(e)

	camX = GetCameraPositionX(0)
	camY = GetCameraPositionY(0)
	camZ = GetCameraPositionZ(0)
	
	newCamY = camY - 20

	if g_KeyPressE == 1 then
		SetCameraPosition(0,camX,newCamY,camZ)  
	end
	
	Prompt(mod(g_PlayerPosX) .. ", " .. mod(g_PlayerPosY) .. ", " .. mod(g_PlayerPosZ) .. ", " .. mod(camY))
end

The script is working (prompting informations) but t produces nothing when E is pressed.

Another question: is it possible to use the mouse rolling to create a zooming / unzooming effect during the game?

Thank you for your help.

Cry \"Havoc!\" and let slip the dogs of war

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AmenMoses

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Posted: 9th Dec 2020 22:08

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gameplayercontrol.lua handles all the camera/player positioning (amongst a ton of other things). So before you can take over control of it yourself you have to either edit that script to suit or disable the parts of it you don't want and do it all in your own script(s).

To take complete control of the camera you call SetCameraOverride ( 3 ) from inside your own script.

Been there, done that, got all the T-Shirts!

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smallg

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Posted: 10th Dec 2020 13:08 Edited at: 10th Dec 2020 13:09

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this will let you scroll the mouse to zoom in and out -press 'E' to reset the camera to move again
you can also hold 'E' to move the camera up and back a little to show how to do a fixed camera position.
should be enough there to show you how to achieve whatever it is you are trying to do

obviously this is just a very quick and dirty way of doing it - the best way would be to rewrite the core logic as amen suggests but don't expect it to be quick or easy

function camera_control_init(e)	
end
local mod = math.modf
local distspeed = 0.2
local heightspeed = 0.3
local zoom, zooming, oldzooming, czdist, czheight = 0, 0, nil, 0, 0
local ttx, tty, ttz, tax, tay, taz, tda, tcamdist, tcamheight, tfx, tfy, tfz

function camera_control_main(e)	
	if oldzooming == nil then 
		oldzooming = g_MouseWheel
	end
	zooming = oldzooming - g_MouseWheel
	oldzooming = g_MouseWheel
	if zooming ~= 0 then 
		ttx=GetPlrObjectPositionX()
		tty=GetPlrObjectPositionY()-35.0
		ttz=GetPlrObjectPositionZ()
		czdist = czdist + (zooming * distspeed)
		czheight = czheight + (zooming * heightspeed)
		--Prompt(czdist.."  ,  "..czheight)
		tcamdist=GetGamePlayerControlThirdpersonCameraDistance() + czdist
		tcamheight=GetGamePlayerControlThirdpersonCameraHeight() + czheight
		tda=WrapValue(180-(0-GetCameraAngleY(0)))
		tax=(math.sin(math.rad(tda))*tcamdist)
		tfx=ttx+tax
		tay=tcamheight
		tfy=tty+tay
		taz=(math.cos(math.rad(tda))*tcamdist)
		tfz=ttz+taz 
	else
		if g_KeyPressE == 1 then
			if zoom == 0 then
				ttx=GetPlrObjectPositionX()
				tty=GetPlrObjectPositionY()-35.0
				ttz=GetPlrObjectPositionZ()
				tcamdist=GetGamePlayerControlThirdpersonCameraDistance() + 20
				tcamheight=GetGamePlayerControlThirdpersonCameraHeight() + 40
				tda=WrapValue(180-(0-GetCameraAngleY(0)))
				tax=(math.sin(math.rad(tda))*tcamdist)
				tfx=ttx+tax
				tay=tcamheight
				tfy=tty+tay
				taz=(math.cos(math.rad(tda))*tcamdist)
				tfz=ttz+taz 
				zoom = 1			
			end 
		elseif zoom == 1 then 
			zoom = 0
			SetCameraOverride(zoom)
		end
	end
	if zoom == 1 or zooming ~= 0 then 
		SetCameraOverride(1)					
		PositionCamera ( 0,tfx,tfy,tfz )
		PointCamera ( 0,ttx,tty,ttz )
	end 
end

+ Code Snippet

function camera_control_init(e)	
end
local mod = math.modf
local distspeed = 0.2
local heightspeed = 0.3
local zoom, zooming, oldzooming, czdist, czheight = 0, 0, nil, 0, 0
local ttx, tty, ttz, tax, tay, taz, tda, tcamdist, tcamheight, tfx, tfy, tfz


function camera_control_main(e)	
	if oldzooming == nil then 
		oldzooming = g_MouseWheel
	end
	zooming = oldzooming - g_MouseWheel
	oldzooming = g_MouseWheel
	if zooming ~= 0 then 
		ttx=GetPlrObjectPositionX()
		tty=GetPlrObjectPositionY()-35.0
		ttz=GetPlrObjectPositionZ()
		czdist = czdist + (zooming * distspeed)
		czheight = czheight + (zooming * heightspeed)
		--Prompt(czdist.."  ,  "..czheight)
		tcamdist=GetGamePlayerControlThirdpersonCameraDistance() + czdist
		tcamheight=GetGamePlayerControlThirdpersonCameraHeight() + czheight
		tda=WrapValue(180-(0-GetCameraAngleY(0)))
		tax=(math.sin(math.rad(tda))*tcamdist)
		tfx=ttx+tax
		tay=tcamheight
		tfy=tty+tay
		taz=(math.cos(math.rad(tda))*tcamdist)
		tfz=ttz+taz 
	else
		if g_KeyPressE == 1 then
			if zoom == 0 then
				ttx=GetPlrObjectPositionX()
				tty=GetPlrObjectPositionY()-35.0
				ttz=GetPlrObjectPositionZ()
				tcamdist=GetGamePlayerControlThirdpersonCameraDistance() + 20
				tcamheight=GetGamePlayerControlThirdpersonCameraHeight() + 40
				tda=WrapValue(180-(0-GetCameraAngleY(0)))
				tax=(math.sin(math.rad(tda))*tcamdist)
				tfx=ttx+tax
				tay=tcamheight
				tfy=tty+tay
				taz=(math.cos(math.rad(tda))*tcamdist)
				tfz=ttz+taz 
				zoom = 1			
			end 
		elseif zoom == 1 then 
			zoom = 0
			SetCameraOverride(zoom)
		end
	end
	if zoom == 1 or zooming ~= 0 then 
		SetCameraOverride(1)					
		PositionCamera ( 0,tfx,tfy,tfz )
		PointCamera ( 0,ttx,tty,ttz )
	end 
end

lua guide for GG
https://steamcommunity.com/sharedfiles/filedetails/?id=398177770
windows 10
i5 @4ghz, 8gb ram, AMD R9 200 series , directx 11

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LeGugusse

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Location: Paris - France

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Posted: 21st Dec 2020 18:39

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Thank you so much!
That's really great!
My only problem with your script is that as soon as I zoom, or I am in a zoom mode, I can't move my character.
I can turn, shoot but moving is impossible...

Cry \"Havoc!\" and let slip the dogs of war

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Nevin

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Posted: 24th Dec 2020 16:53 Edited at: 24th Dec 2020 17:07

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This is for changing fov.

just a copy paste of what I did to get this working. Im not sure if I made some adjustments to the gameplayercontrol script. game_pause, drive_on_map, zoom, g_mousewheellast, and g_fov are my own variables for my game. Like I said just a copy paste.. I hope this helps

, or at least is a stepping stone

-- zoom in and out
if game_pause == 0 and g_drive_on_map == 0 then
zoom = g_MouseWheel - g_mousewheellast
g_mousewheellast = g_MouseWheel
if zoom < 0 and g_fov < 60 and g_pressed == 0 then
g_fov=g_fov+2
SetCameraPanelFOV(g_fov)
end
if zoom > 25 and g_fov > 25 and g_pressed == 0 then
g_fov=g_fov-2
SetCameraPanelFOV(g_fov)
end
if g_fov < 25 then
g_fov=25
end
if g_fov > 40 then -- 40
g_fov=40
end
end

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Scripts / Change Camera Height in a third person game

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