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

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Golelorn

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

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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.

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blink0k

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

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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

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Golelorn

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Joined: 20th Nov 2016

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Posted: 1st Apr 2019 23:45

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Thanks Blink!

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Golelorn

8

Years of Service

User Offline

Joined: 20th Nov 2016

Location:

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

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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

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blink0k

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Location: the land of oz

Posted: 2nd Apr 2019 04:34

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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

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Golelorn

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Posted: 2nd Apr 2019 04:35

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

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Golelorn

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Posted: 2nd Apr 2019 04:47

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

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blink0k

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Posted: 2nd Apr 2019 06:03

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

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Golelorn

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Posted: 2nd Apr 2019 06:19

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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.

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