MoveEntity improvement

Blitz3D Forums/Blitz3D Programming/MoveEntity improvement

bytecode77

(Posted 2006) [#1]

hello!

for my software rendered 3d engine i am looking for a MoveEntity() improvement!

this is what i got yet:

Function rMoveEntity(ent, x#, y#, z#)
re.rEntity = Object.rEntity(ent)
re\x# = re\x# + Cos(re\pitch#) * Cos(re\yaw#) * x#
re\y# = re\y# + Cos(re\pitch#) * Sin(re\yaw#) * y#
re\z# = re\z# + Sin(re\pitch#) * z#
End Function

but it doesnt work :(

b32	(Posted 2006) [#2]

Try to send the rEntity object itself as a parameter:
Function rMoveEntity(re.rEntity, x#, y#, z#)

And move the mesh itself too to see any result:
PositionEntity re\ent, x#, y#, z#

bytecode77

(Posted 2006) [#3]

Try to send the rEntity object itself as a parameter:
Function rMoveEntity(re.rEntity, x#, y#, z#)
this doesnt make sense, because the point is not that the object = Null

And move the mesh itself too to see any result:
PositionEntity re\ent, x#, y#, z#
???

b32	(Posted 2006) [#4]

Ok, I didn't understand it properly. What is 'ent' ?

bytecode77

(Posted 2006) [#5]

the entity.
my problem is the calculation of the coordinates, and no other...

b32	(Posted 2006) [#6]

I hope this does make any sense then: :)

	rx# = rx# + (Cos(pitch#) * z + Sin(yaw) * x)
	ry# = ry# + (Sin(pitch#) * z + Cos(roll) * y)
	rz# = rz# + (Cos(yaw) * x + Sin(roll) * y)

bytecode77

(Posted 2006) [#7]

hm, well, it is a lil bit better than my b*llsh*t, but it doesnt work yet sry :(...

b32	(Posted 2006) [#8]

Yes, you are right, I thought of it too easy. After a few more tries, it now uses only the Yaw, but in a correct way.
Using the Pitch and Roll should sort or less go in the same way, only using X,Y and Y,Z.
I use now Yaw and Yaw+90 to calculate the direction. Maybe there is an easier way, I don't know.

; Createcube Example
; ------------------

Graphics3D 640,480
SetBuffer BackBuffer()

camera=CreateCamera()

light=CreateLight()
RotateEntity light,90,0,0

; Create cube
cube=CreateCube()

PositionEntity cube,0,0,5

While Not KeyDown( 1 )

If KeyDown(203) Then TurnEntity cube, 0, 1, 0
If KeyDown(205) Then TurnEntity cube, 0, -1, 0

If KeyDown(200) Then iMoveEntity cube, -0.0, 0, -0.1
If KeyDown(208) Then iMoveEntity cube, +0.0, 0, +0.1

RenderWorld
Flip
Wend

End

Function iMoveEntity(mesh, x#, y#, z#)

		rx# = EntityX(mesh)
		ry# = EntityY(mesh)
		rz# = EntityZ(mesh)
		
		;1
		yaw# = EntityYaw(mesh)
		
	rx# = rx# + (Cos(yaw# + 90) * z)
	rz# = rz# + (Sin(yaw# + 90) * z)
	
	rx# = rx# + (Cos(yaw#) * x)
	rz# = rz# + (Sin(yaw#) * x)

	PositionEntity mesh, rx, ry, rz
	
End Function

By the way, how is your shadow thing coming along ?

bytecode77

(Posted 2006) [#9]

well, thank you for help :)
if someone has got an idea to make it work like i tried in the first code in this thread...please let me know ;)

ps: the shadow system isn't doing much since the last 2 months because we dont know how to speed it up... don't hope on our system, it is just a demo and perhabs it will be a demo 4ever :(...

(tu) sinu

(Posted 2006) [#10]

Why not download the minib3d module for bmax, im guessing you could work it out from their using the source cos it has those type of functions.

bytecode77

(Posted 2006) [#11]

they are using matrices nd vectors, but not me :(

b32	(Posted 2006) [#12]

I tried and tried, but I can't. :( So I searched some more and I found this, from jfk:

  xl1#=zwww(i)*Sin(gamma)+xwww(i)*Cos(gamma)
  yl1#=ywww(i)
  zl1#=zwww(i)*Cos(gamma)-xwww(i)*Sin(gamma)

  xl2#=xl1
  yl2#=yl1*Cos(beta)-zl1*Sin(beta)
  zl2#=yl1*Sin(beta)+zl1*Cos(beta)
 
  xl3#=(yl2*Sin(alpha)+xl2*Cos(alpha))
  yl3#=(yl2*Cos(alpha)-xl2*Sin(alpha))
  zl3#=(zl2)

It is from his 3d engine in the code archives:
http://www.blitzbasic.com/codearcs/codearcs.php?code=418

bytecode77

(Posted 2006) [#13]

well, i don't know what this is, but i have got s.th like this put into my engine, and it doesnt work :(

edit: here is what i got yet http://www.blitzbasic.com/gallery/view_pic.php?id=1384&gallery=&page=1

b32	(Posted 2006) [#14]

Today, I'm not at home. This code seems to do the right thing, but I can only get it to work on 2 angles (it is one more allready!). Here is the source:

; Createcube Example
; ------------------

Graphics3D 640,480,0,2
SetBuffer BackBuffer()

camera=CreateCamera()
;CameraZoom camera, 2.4

light=CreateLight()
RotateEntity light,90,0,0

; Create cube
cube=CreateCube()

PositionEntity cube,0,0,5

While Not KeyDown( 1 )

If KeyDown(203) Then iMoveEntity cube, -0.1, 0, 0
If KeyDown(205) Then iMoveEntity cube, +0.1, 0, 0

If KeyDown(200) Then iMoveEntity cube, -0.0, 0, -0.1
If KeyDown(208) Then iMoveEntity cube, +0.0, 0, +0.1

If KeyDown(16) Then TurnEntity cube, 0, -1, 0
If KeyDown(17) Then TurnEntity cube, 0, +1, 0

If KeyDown(18) Then TurnEntity cube, -1, 0, 0
If KeyDown(19) Then TurnEntity cube, +1, 0, 0

If KeyDown(20) Then TurnEntity cube, 0, 0, -1
If KeyDown(21) Then TurnEntity cube, 0, 0, +1

If KeyHit(30) Then
	PositionEntity cube, 0 ,0, 5
	RotateEntity cube, 0, 0, 0
End If

RenderWorld

Text 0, 0, "Cursor keys to move"
Text 0, 20, "Q/W Rotate Yaw"
Text 0, 40, "E/R Rotate Pitch"
Text 0, 60, "A reset"

Flip
Wend

End

Function iMoveEntity(mesh, x#, y#, z#)

		rx# = EntityX(mesh)
		ry# = EntityY(mesh)
		rz# = EntityZ(mesh)
		
		;1
		gamma# = EntityYaw(mesh)
		beta#  = -EntityPitch(mesh)
		alpha# = EntityRoll(mesh)

  xl1#=z#*Sin(gamma)+x#*Cos(gamma)
  yl1#=y#
  zl1#=z#*Cos(gamma)-x#*Sin(gamma)

  xl2#=xl1
  yl2#=yl1*Cos(beta)-zl1*Sin(beta)
  zl2#=yl1*Sin(beta)+zl1*Cos(beta)
 
  xl3#=(yl2*Sin(alpha)+xl2*Cos(alpha))
  yl3#=(yl2*Cos(alpha)-xl2*Sin(alpha))
  zl3#=(zl2)


	
	rx = rx + xl3
	ry = ry - yl3
	rz = rz - zl3
		
	PositionEntity mesh, rx, ry, rz
	
End Function

The third angle works, but it somehow goes in the wrong direction. This code applies each angle of rotation (pitch/yaw/roll) one by one, which is the right way to do it, at least, that is what I've read somewhere.

bytecode77

(Posted 2006) [#15]

it doesnt :(

; Createcube Example
; ------------------

Graphics3D 640,480,0,2
SetBuffer BackBuffer()

camera=CreateCamera()
;CameraZoom camera, 2.4

light=CreateLight()
RotateEntity light,90,0,0

; Create cube
cube=CreateCube()

PositionEntity cube,0,0,5

While Not KeyDown( 1 )

	iMoveEntity camera, (KeyDown(32) - KeyDown(30)) * .2, 0, (KeyDown(31) - KeyDown(17)) * .2
	TurnEntity camera, MouseYSpeed(), -MouseXSpeed(), 0
	MoveMouse GraphicsWidth() / 2, GraphicsHeight() / 2


RenderWorld


Flip
Wend

End

Function iMoveEntity(mesh, x#, y#, z#)

		rx# = EntityX(mesh)
		ry# = EntityY(mesh)
		rz# = EntityZ(mesh)
		
		;1
		gamma# = EntityYaw(mesh)
		beta#  = -EntityPitch(mesh)
		alpha# = EntityRoll(mesh)

  xl1#=z#*Sin(gamma)+x#*Cos(gamma)
  yl1#=y#
  zl1#=z#*Cos(gamma)-x#*Sin(gamma)

  xl2#=xl1
  yl2#=yl1*Cos(beta)-zl1*Sin(beta)
  zl2#=yl1*Sin(beta)+zl1*Cos(beta)
 
  xl3#=(yl2*Sin(alpha)+xl2*Cos(alpha))
  yl3#=(yl2*Cos(alpha)-xl2*Sin(alpha))
  zl3#=(zl2)


	
	rx = rx + xl3
	ry = ry - yl3
	rz = rz - zl3
		
	PositionEntity mesh, rx, ry, rz
	
End Function

b32	(Posted 2006) [#16]

I see what you mean, it is because the three angles affect each other. When Roll=180, the Yaw works upside down. As long as the three angles are not handled correctly, the function will give strange results.

markcw

(Posted 2006) [#17]