Is there a formula/command for the camera to adjust its position to have the entire object in view?

Author

Message

Golelorn

7

Years of Service

User Offline

Joined: 20th Nov 2016

Location:

Posted: 1st Apr 2019 23:25 Edited at: 1st Apr 2019 23:25

Link

For instance, if my object is 10x15 (or even 100X150)how far back or forward should I move the camera, so the entire thing is in view and showing as little "black" as possible? Or are their commands to set the X and Y for the camera?

I see a lot of camera commands, but the instructions are pretty confusing for someone with little knowledge.

Thanks.

Back to top

Profile PM

blink0k

Moderator

11

Years of Service

User Offline

Joined: 22nd Feb 2013

Location: the land of oz

Posted: 1st Apr 2019 23:35 Edited at: 1st Apr 2019 23:36

Link

This post has been marked by the post author as the answer.

Have a look here. Madbit has a very simple and elegant solution

I have done some additional work on it here. Either my math or my theory didn't hold up

// Project: test27
// Created: 2019-03-19

// show all errors
SetErrorMode(2)

// set window properties
SetWindowTitle( "test27" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts

SetSunActive(1)
SetSunDirection(0.5, -1, 0.5)
SetSunColor(0x80, 0x80, 0x80)
SetambientColor(0x80, 0x80, 0x80)

id = CreateObjectBox(1, 1, 3)
//SetObjectVisible(id, 0)

b = CReateObjectPlane(0.1, 0.1)
SetObjectColor(b, 0, 0xff, 0, 0xff)
FixObjectToObject(b, id)

text as string
//text = getClipboardText()
text = "Robert M"+chr(0xFC)+"ller"
SetClipboardText(text)
text = GetClipboardText()

h as String
h = hex(asc(text))

type point
	x as float
	y as float
	z as float
endtype

SetCameraPosition(1, 0, 2, -5)

bounds as integer[]

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMinX(id), GetObjectSizeMinY(id), GetObjectSizeMinZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMinX(id), GetObjectSizeMaxY(id), GetObjectSizeMinZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMaxX(id), GetObjectSizeMaxY(id), GetObjectSizeMinZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMaxX(id), GetObjectSizeMinY(id), GetObjectSizeMinZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMinX(id), GetObjectSizeMinY(id), GetObjectSizemaxZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMinX(id), GetObjectSizeMaxY(id), GetObjectSizemaxZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMaxX(id), GetObjectSizeMaxY(id), GetObjectSizemaxZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMaxX(id), GetObjectSizeMinY(id), GetObjectSizemaxZ(id))
bounds.insert(b)

for i=0 to bounds.length
	FixObjectToObject(bounds[i], id)
next

bb as integer[]
for i=0 to 3
	b = CreateObjectPlane(0.1, 0.1)
	SetObjectColor(b, 0, 0xff, 0, 0xff)
	bb.insert(b)
next

SetCameraPosition(1, -2, 2, -4)
SetCameraLookAt(1, 0, 0, 0, 0)

RotateObjectGlobalY(id, random(1, 360))
RotateObjectGlobalZ(id, random(1, 360))

global largest as integer

do

if GetRawKeyPressed(38)
		MoveCameraLocalZ(1, 0.1)
	endif

if GetRawKeyPressed(40)
		MoveCameraLocalZ(1, -0.1)
	endif

if GetRawKeyPressed(asc("T"))
		RotateObjectGlobalY(id, random(1, 360))
		RotateObjectGlobalZ(id, random(1, 360))
	endif

if GetRawKeyPressed(asc("R"))
		SetCameraPosition(1, -2, 2, -4)
		SetCameraLookAt(1, 0, 0, 0, 0)
	endif

if GetRawKeyPressed(32)
		checkbounds(id, bounds, bb, 1)
	else
		checkbounds(id, bounds, bb, 0)
	endif

print("SPACE-To frame object, T-Rotate object R-Reset camera")
    Sync()
loop

function	CheckBounds(id as integer, bounds as integer[], bb as integer[], fct as integer)
	p		as point
	f		as point
	t		as point
	d		as float
	x		as integer
	rp		as point
	lp		as point
	bp		as point
	tp		as point
	ip		as float[]
	mp		as point
	op		as point
	a		as float

f.x = 99999999
	f.y = 99999999

t.x = -99999999
	t.y = -99999999

for i=0 to bounds.length
		p.x = GetScreenXFrom3D(GetObjectWorldX(bounds[i]), GetObjectWorldY(bounds[i]), GetObjectWorldZ(bounds[i]))
		p.y = GetScreenYFrom3D(GetObjectWorldX(bounds[i]), GetObjectWorldY(bounds[i]), GetObjectWorldZ(bounds[i]))

if p.x < f.x
			f.x = p.x
		endif

if p.x > t.x
			t.x = p.x
		endif

if p.y < f.y
			f.y = p.y
		endif

if p.y > t.y
			t.y = p.y
		endif
	next

d = Distance3D(GetObjectPos(id), GetCameraPos(1))

op = GetObjectPos(id)

mp.x = Get3DVectorXFromScreen( f.x + (t.x - f.x) / 2, f.y + (t.y - f.y) / 2) * d + GetCameraX(1)
	mp.y = Get3DVectorYFromScreen( f.x + (t.x - f.x) / 2, f.y + (t.y - f.y) / 2) * d + GetCameraY(1)
	mp.z = Get3DVectorZFromScreen( f.x + (t.x - f.x) / 2, f.y + (t.y - f.y) / 2) * d + GetCameraZ(1)

rp.x = Get3DVectorXFromScreen( f.x, f.y + (t.y - f.y) / 2) * d + GetCameraX(1)
	rp.y = Get3DVectorYFromScreen( f.x, f.y + (t.y - f.y) / 2) * d + GetCameraY(1)
	rp.z = Get3DVectorZFromScreen( f.x, f.y + (t.y - f.y) / 2) * d + GetCameraZ(1)

lp.x = Get3DVectorXFromScreen( t.x, f.y + (t.y - f.y) / 2) * d + GetCameraX(1)
	lp.y = Get3DVectorYFromScreen( t.x, f.y + (t.y - f.y) / 2) * d + GetCameraY(1)
	lp.z = Get3DVectorZFromScreen( t.x, f.y + (t.y - f.y) / 2) * d + GetCameraZ(1)

bp.x = Get3DVectorXFromScreen( f.x + (t.x - f.x) / 2, t.y ) * d + GetCameraX(1)
	bp.y = Get3DVectorYFromScreen( f.x + (t.x - f.x) / 2, t.y ) * d + GetCameraY(1)
	bp.z = Get3DVectorZFromScreen( f.x + (t.x - f.x) / 2, t.y ) * d + GetCameraZ(1)

tp.x = Get3DVectorXFromScreen( f.x + (t.x - f.x) / 2, f.y ) * d + GetCameraX(1)
	tp.y = Get3DVectorYFromScreen( f.x + (t.x - f.x) / 2, f.y ) * d + GetCameraY(1)
	tp.z = Get3DVectorZFromScreen( f.x + (t.x - f.x) / 2, f.y ) * d + GetCameraZ(1)

if fct = 1
		d = 0
		ip.insert(Distance3D(lp, rp) * 0.8)
		ip.insert(Distance3D(tp, bp) * 0.8)
		for x=0 to ip.length
			if ip[x] > d
				d = ip[x]
				largest=x
			endif
		next
		a = GetCameraFOV(1) / 2
		d = d / tan(a)
		SetCameraLookAt(1, mp.x, mp.y, mp.z, 0)
		SetCameraPosition(1, mp.x,  mp.y,  mp.z)
		MoveCameraLocalZ(1, -d)
	endif

SetObjectPosition(bb[0], tp.x, tp.y, tp.z)
	SetObjectLookAt(bb[0], GetCameraX(1),  GetCameraY(1),  GetCameraZ(1), 0)
	SetObjectPosition(bb[1], lp.x, lp.y, lp.z)
	SetObjectLookAt(bb[1], GetCameraX(1),  GetCameraY(1),  GetCameraZ(1), 0)
	SetObjectPosition(bb[2], bp.x, bp.y, bp.z)
	SetObjectLookAt(bb[2], GetCameraX(1),  GetCameraY(1),  GetCameraZ(1), 0)
	SetObjectPosition(bb[3], rp.x, rp.y, rp.z)
	SetObjectLookAt(bb[3], GetCameraX(1),  GetCameraY(1),  GetCameraZ(1), 0)

DrawBox(f.x, f.y, t.x, t.y, 0x808080, 0x808080, 0x808080, 0x808080, 0)
	DrawLine(f.x, f.y + (t.y - f.y) / 2, f.x + (t.x - f.x) / 2, f.y + (t.y - f.y) / 2, 0x0000ff, 0x0000ff, 0)
	DrawLine(f.x + (t.x - f.x) / 2, f.y + (t.y - f.y) / 2, f.x + (t.x - f.x) / 2, t.y, 0x0000ff, 0x0000ff, 0)

endfunction

function	Distance3D(fp as point, tp as point)
	dist 		as float
	dist = sqrt((fp.x - tp.x)^2 + (fp.y - tp.y)^2 + (fp.z - tp.z)^2 )
endfunction dist

function	GetCameraPos(id as integer)
	p as point

p.x = GetCameraX(id)
	p.y = GetCameraY(id)
	p.z = GetCameraZ(id)
endfunction p

function	GetObjectPos(id as integer)
	p as point

p.x = GetObjectX(id)
	p.y = GetObjectY(id)
	p.z = GetObjectZ(id)
endfunction p

+ Code Snippet

// Project: test27
// Created: 2019-03-19

// show all errors
SetErrorMode(2)

// set window properties
SetWindowTitle( "test27" )
SetWindowSize( 1024, 768, 0 )
SetWindowAllowResize( 1 ) // allow the user to resize the window

// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 30, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts

SetSunActive(1)
SetSunDirection(0.5, -1, 0.5)
SetSunColor(0x80, 0x80, 0x80)
SetambientColor(0x80, 0x80, 0x80)

id = CreateObjectBox(1, 1, 3)
//SetObjectVisible(id, 0)

b = CReateObjectPlane(0.1, 0.1)
SetObjectColor(b, 0, 0xff, 0, 0xff)
FixObjectToObject(b, id)


text as string
//text = getClipboardText()
text = "Robert M"+chr(0xFC)+"ller"
SetClipboardText(text)
text = GetClipboardText()

h as String
h = hex(asc(text))

type point
	x as float
	y as float
	z as float
endtype

SetCameraPosition(1, 0, 2, -5)

bounds as integer[]

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMinX(id), GetObjectSizeMinY(id), GetObjectSizeMinZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMinX(id), GetObjectSizeMaxY(id), GetObjectSizeMinZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMaxX(id), GetObjectSizeMaxY(id), GetObjectSizeMinZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMaxX(id), GetObjectSizeMinY(id), GetObjectSizeMinZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMinX(id), GetObjectSizeMinY(id), GetObjectSizemaxZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMinX(id), GetObjectSizeMaxY(id), GetObjectSizemaxZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMaxX(id), GetObjectSizeMaxY(id), GetObjectSizemaxZ(id))
bounds.insert(b)

b = CReateObjectPlane(0.1, 0.1)
SetObjectPosition(b, GetObjectSizeMaxX(id), GetObjectSizeMinY(id), GetObjectSizemaxZ(id))
bounds.insert(b)

for i=0 to bounds.length
	FixObjectToObject(bounds[i], id)
next

bb as integer[]
for i=0 to 3
	b = CreateObjectPlane(0.1, 0.1)
	SetObjectColor(b, 0, 0xff, 0, 0xff)
	bb.insert(b)
next

SetCameraPosition(1, -2, 2, -4)
SetCameraLookAt(1, 0, 0, 0, 0)

RotateObjectGlobalY(id, random(1, 360))
RotateObjectGlobalZ(id, random(1, 360))

global largest as integer

do

	if GetRawKeyPressed(38)
		MoveCameraLocalZ(1, 0.1)
	endif

	if GetRawKeyPressed(40)
		MoveCameraLocalZ(1, -0.1)
	endif

	if GetRawKeyPressed(asc("T"))
		RotateObjectGlobalY(id, random(1, 360))
		RotateObjectGlobalZ(id, random(1, 360))
	endif

	if GetRawKeyPressed(asc("R"))
		SetCameraPosition(1, -2, 2, -4)
		SetCameraLookAt(1, 0, 0, 0, 0)
	endif

	if GetRawKeyPressed(32)
		checkbounds(id, bounds, bb, 1)
	else
		checkbounds(id, bounds, bb, 0)
	endif

	print("SPACE-To frame object, T-Rotate object R-Reset camera")
    Sync()
loop


function	CheckBounds(id as integer, bounds as integer[], bb as integer[], fct as integer)
	p		as point
	f		as point
	t		as point
	d		as float
	x		as integer
	rp		as point
	lp		as point
	bp		as point
	tp		as point
	ip		as float[]
	mp		as point
	op		as point
	a		as float

	f.x = 99999999
	f.y = 99999999

	t.x = -99999999
	t.y = -99999999


	for i=0 to bounds.length
		p.x = GetScreenXFrom3D(GetObjectWorldX(bounds[i]), GetObjectWorldY(bounds[i]), GetObjectWorldZ(bounds[i]))
		p.y = GetScreenYFrom3D(GetObjectWorldX(bounds[i]), GetObjectWorldY(bounds[i]), GetObjectWorldZ(bounds[i]))

		if p.x < f.x
			f.x = p.x
		endif

		if p.x > t.x
			t.x = p.x
		endif

		if p.y < f.y
			f.y = p.y
		endif

		if p.y > t.y
			t.y = p.y
		endif
	next

	d = Distance3D(GetObjectPos(id), GetCameraPos(1))

	op = GetObjectPos(id)

	mp.x = Get3DVectorXFromScreen( f.x + (t.x - f.x) / 2, f.y + (t.y - f.y) / 2) * d + GetCameraX(1)
	mp.y = Get3DVectorYFromScreen( f.x + (t.x - f.x) / 2, f.y + (t.y - f.y) / 2) * d + GetCameraY(1)
	mp.z = Get3DVectorZFromScreen( f.x + (t.x - f.x) / 2, f.y + (t.y - f.y) / 2) * d + GetCameraZ(1)

	rp.x = Get3DVectorXFromScreen( f.x, f.y + (t.y - f.y) / 2) * d + GetCameraX(1)
	rp.y = Get3DVectorYFromScreen( f.x, f.y + (t.y - f.y) / 2) * d + GetCameraY(1)
	rp.z = Get3DVectorZFromScreen( f.x, f.y + (t.y - f.y) / 2) * d + GetCameraZ(1)

	lp.x = Get3DVectorXFromScreen( t.x, f.y + (t.y - f.y) / 2) * d + GetCameraX(1)
	lp.y = Get3DVectorYFromScreen( t.x, f.y + (t.y - f.y) / 2) * d + GetCameraY(1)
	lp.z = Get3DVectorZFromScreen( t.x, f.y + (t.y - f.y) / 2) * d + GetCameraZ(1)

	bp.x = Get3DVectorXFromScreen( f.x + (t.x - f.x) / 2, t.y ) * d + GetCameraX(1)
	bp.y = Get3DVectorYFromScreen( f.x + (t.x - f.x) / 2, t.y ) * d + GetCameraY(1)
	bp.z = Get3DVectorZFromScreen( f.x + (t.x - f.x) / 2, t.y ) * d + GetCameraZ(1)

	tp.x = Get3DVectorXFromScreen( f.x + (t.x - f.x) / 2, f.y ) * d + GetCameraX(1)
	tp.y = Get3DVectorYFromScreen( f.x + (t.x - f.x) / 2, f.y ) * d + GetCameraY(1)
	tp.z = Get3DVectorZFromScreen( f.x + (t.x - f.x) / 2, f.y ) * d + GetCameraZ(1)

	if fct = 1
		d = 0
		ip.insert(Distance3D(lp, rp) * 0.8)
		ip.insert(Distance3D(tp, bp) * 0.8)
		for x=0 to ip.length
			if ip[x] > d
				d = ip[x]
				largest=x
			endif
		next
		a = GetCameraFOV(1) / 2
		d = d / tan(a)
		SetCameraLookAt(1, mp.x, mp.y, mp.z, 0)
		SetCameraPosition(1, mp.x,  mp.y,  mp.z)
		MoveCameraLocalZ(1, -d)
	endif


	SetObjectPosition(bb[0], tp.x, tp.y, tp.z)
	SetObjectLookAt(bb[0], GetCameraX(1),  GetCameraY(1),  GetCameraZ(1), 0)
	SetObjectPosition(bb[1], lp.x, lp.y, lp.z)
	SetObjectLookAt(bb[1], GetCameraX(1),  GetCameraY(1),  GetCameraZ(1), 0)
	SetObjectPosition(bb[2], bp.x, bp.y, bp.z)
	SetObjectLookAt(bb[2], GetCameraX(1),  GetCameraY(1),  GetCameraZ(1), 0)
	SetObjectPosition(bb[3], rp.x, rp.y, rp.z)
	SetObjectLookAt(bb[3], GetCameraX(1),  GetCameraY(1),  GetCameraZ(1), 0)

	DrawBox(f.x, f.y, t.x, t.y, 0x808080, 0x808080, 0x808080, 0x808080, 0)
	DrawLine(f.x, f.y + (t.y - f.y) / 2, f.x + (t.x - f.x) / 2, f.y + (t.y - f.y) / 2, 0x0000ff, 0x0000ff, 0)
	DrawLine(f.x + (t.x - f.x) / 2, f.y + (t.y - f.y) / 2, f.x + (t.x - f.x) / 2, t.y, 0x0000ff, 0x0000ff, 0)

endfunction



function	Distance3D(fp as point, tp as point)
	dist 		as float
	dist = sqrt((fp.x - tp.x)^2 + (fp.y - tp.y)^2 + (fp.z - tp.z)^2 )
endfunction dist

function	GetCameraPos(id as integer)
	p as point

	p.x = GetCameraX(id)
	p.y = GetCameraY(id)
	p.z = GetCameraZ(id)
endfunction p

function	GetObjectPos(id as integer)
	p as point

	p.x = GetObjectX(id)
	p.y = GetObjectY(id)
	p.z = GetObjectZ(id)
endfunction p

Back to top

Profile PM

Golelorn

7

Years of Service

User Offline

Joined: 20th Nov 2016

Location:

Posted: 1st Apr 2019 23:45

Link

Thanks Blink!

Back to top

Profile PM

Golelorn

7

Years of Service

User Offline

Joined: 20th Nov 2016

Location:

Posted: 2nd Apr 2019 04:26 Edited at: 2nd Apr 2019 06:24

Link

With your theory Blink I was able to come up with this:

I still need to adjust for objects that have a much larger height than width. But, so far works pretty nice. It "should" also center on objects despite its origin.

+ Code Snippet

function AutoCam(ObjID)
	SetObjectScalePermanent( ObjID, 1, 1, 1 )
	width# = (GetObjectSizeMaxX(ObjID)-GetObjectSizeMinX(ObjID))/2
	height# = (GetObjectSizeMaxY(ObjID)-GetObjectSizeMinY(ObjID))/2
	length# = (GetObjectSizeMaxZ(ObjID)-GetObjectSizeMinZ(ObjID))/2
	x# = GetObjectSizeMaxX(ObjID)
	x# = x#-width#
	y# = GetObjectSizeMaxY(ObjID)
	y# = y#-height#
	z# = GetObjectSizeMaxZ(ObjID)
	z# = z#-length#

	missingangle# = 180-90-35
	length# = (((width#*1.25)/sin(35))*sin(missingangle#))*2
	SetCameraPosition( 1, x#, y#, z#)
	SetCameraLookAt( 1, x#, y#, z#, 0 )
	MoveCameraLocalZ( 1, -length#-.25 )
endfunction

Back to top

Profile PM

blink0k

Moderator

11

Years of Service

User Offline

Joined: 22nd Feb 2013

Location: the land of oz

Posted: 2nd Apr 2019 04:34

Link

Yes. It's important to remember that GetObjectSizeMaxX/Y/Z and GetObjectSizeMinX/Y/Z do not reflect rotation or scaling of the object.
So say if the object is scaled up by 2 and rotated 45o around Y axis, GetObjectSizeMin/Max values will not change

Back to top

Profile PM

Golelorn

7

Years of Service

User Offline

Joined: 20th Nov 2016

Location:

Posted: 2nd Apr 2019 04:35

Link

Ok, that shouldn't really hurt me. But I will remember in case I am wrong.

Back to top

Profile PM

Golelorn

7

Years of Service

User Offline

Joined: 20th Nov 2016

Location:

Posted: 2nd Apr 2019 04:47

Link

Sorry, marked my original questions as answer. Fixed that to mark Blink0K as the answer.

Back to top

Profile PM

blink0k

Moderator

11

Years of Service

User Offline

Joined: 22nd Feb 2013

Location: the land of oz

Posted: 2nd Apr 2019 06:03

Link

I think;
GetObjectSizeMaxZ(ObjID)-GetObjectSizeMinZ(ObjID)/2
Should read;
(GetObjectSizeMaxZ(ObjID)-GetObjectSizeMinZ(ObjID)/2

Back to top

Profile PM

Golelorn

7

Years of Service

User Offline

Joined: 20th Nov 2016

Location:

Posted: 2nd Apr 2019 06:19

Link

Wow. Thank you, Blink. I owe ya.

You have no idea how many times those order of operations have come back to bite me in my ass.

Back to top

Profile PM

Sorry your browser is not supported!

AppGameKit Classic Chat / [SOLVED] Is there a formula/command for the camera to adjust its position to have the entire object in view?