http://rel.betterwebber.com/index.php?a ... =Tutorials
-The Awakened
Statistics: Posted by The Awakened — Sun Dec 04, 2005 12:19 pm
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Your confusing yourself. Rotations are very easy to do when you just use the formulae... Take a look at the HAW (3D the Half Assed Way) tutorial on this site for an idiot proof tutorial
, it covers simple rotations of wireframe models.matt
Statistics: Posted by matt2jones — Sun Dec 04, 2005 5:51 am
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Taking a look at this article over here:
http://www.delphi3d.net/articles/viewar ... iewing.htm
There are a few things I still need know.
In Fig. 2 in that article, first matrix on the 4th column, do I have to worry about the -x -y -z stuff? Also
Also on the 4th row and coloumn on two matrix which both equals 1, do I leave that alone?
On the second matrix, does the Rx, Ux, Vx etc mean R * x, U * x, V * x?
Last question, with the final rotate feature, which part on the second matrix do I use?
Sorry for the excessive amount of newbie questions.
Statistics: Posted by Guest — Sun Dec 04, 2005 3:36 am
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You say it's "stuck in first person mode", what I think you mean by this is when you try and rotate the ship it moves off one side of the screen, goes behind you, and comes out the other side.
If that's the case, visualise this:
Code:
*--------* [Camera points-> | Ship | *--------* Code:
*-* |p| |i| |h| |S| *-* [Camera points-> Almost all rotation formulae only work for rotating around the origin.
So, if you want the ship to revolve around the middle of itself, you have to move it so that the origin is in the middle of it. This is really easy, just find the coordinates of the middle of the ship, and subtract them from all the other points in the ship.
Then do your rotations. Now the ship will be rotated about it's middle, but it will look like this:
Code:
*-----------------* | p | | i | | h [CAM]-> | | S | *-----------------* So you'll now be looking at the rotated ship from the inside. You have to move it back to where is was originally to get the correct rotated view of it. Doing that is easy, just add back to the coords of every point in the ship the values you subtracted from them in the first step.Recap:* Pick point to rotate around* Translate ship model so that point is a origin* Rotate Ship about origin* Translate ship model so that the middle point is back where it was* Draw the model.I hope this helps,mattStatistics: Posted by matt2jones — Sat Dec 03, 2005 8:45 am
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First one I posted this topic in the wrong sector.
Second one is that I forgot to tell that you need freebasic to use this code.
Statistics: Posted by Guest — Sat Dec 03, 2005 1:08 am
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Arrow Keys to X and Y rotate the ship.
E and Q rotates the model by Z axis.
The current problem I am facing atm is, the ship rolls as its either facing down or up. Making me assume that it's stuck in first person mode. What I wanted to do is, get the ship to be able to pitch up and down, turn left and right, and roll reguardless of what angle its at.
I tried Faster 3D Rotation by Eclipzer but it was a no go.
Heres the code:
Code:
#define SC_UP &h48#define SC_LEFT &h4B#define SC_RIGHT &h4D#define SC_DOWN &h50#define SC_Q &h10#define SC_E &h12#define pi 3.1415926535897932TYPE V3D X as Single Y as Single Z as SingleEND TYPETYPE SimpleEnt Rot as V3D Coor as V3DEND TYPEType Edges PointA as V3D PointB as V3DEND TYPEDeclare SUB rotpt (x1!, y1!, z1!, rotx!, roty!, rotz!, nx!, ny!, nz!)Declare SUB Point3D (xA!, yA!, zA!, xP, yP, DST)CONST LENS = 384CONST CenterX=320CONST CenterY=240Dim ToyLine(36) as EdgesDim ToyVert(16) as V3DDim TempX, TempY, TempZ, RotPY, RotPX, RotPZ as SingleDim Dist, ProjX(2), ProjY(2), PrevX, PrevY as IntegerDIM TOM, EEE as IntegerFOR TOM=1 to 16 READ ToyVert(TOM).X READ ToyVert(TOM).Z READ ToyVert(TOM).Y ToyVert(TOM).Z=-ToyVert(TOM).Z ToyVert(TOM).Y=-ToyVert(TOM).YNEXT TOMFor TOM =1 to 36 READ StartPNT READ EndPNT ToyLine(TOM).PointA.X=ToyVert(StartPNT+1).X ToyLine(TOM).PointA.Y=ToyVert(StartPNT+1).Y ToyLine(TOM).PointA.Z=ToyVert(StartPNT+1).Z ToyLine(TOM).PointB.X=ToyVert(EndPNT+1).X ToyLine(TOM).PointB.Y=ToyVert(EndPNT+1).Y ToyLine(TOM).PointB.Z=ToyVert(EndPNT+1).ZNext TOM Screen 18RotPY!=0RotPX!=0RotPZ!=0 DOFOR EEE = 1 to 36 rotpt ToyLine(EEE).PointA.X,ToyLine(EEE).PointA.Y,ToyLine(EEE).PointA.Z,RotPX!,RotPY!,RotPZ!,TempX!,TempY!,TempZ! Point3D TempX!, TempY!, TempZ!, ProjX(1), ProjY(1), Dist rotpt ToyLine(EEE).PointB.X,ToyLine(EEE).PointB.Y,ToyLine(EEE).PointB.Z,RotPX!,RotPY!,RotPZ!,TempX!,TempY!,TempZ! Point3D TempX!, TempY!, TempZ!, ProjX(2), ProjY(2), Dist If Dist>0 Then LINE (ProjX(1),ProjY(1))-(ProjX(2),ProjY(2)),15 END IF NEXT EEESLEEP 1CLSLocate 5,5:Print "3D Wireframe Ship Test"if multikey(SC_LEFT) then RotPY!=RotPY!+.005end ifif multikey(SC_Right) then RotPY!=RotPY!-.005end ifif multikey(SC_UP) then RotPX!=RotPX!-.005end ifif multikey(SC_Down) then RotPX!=RotPX!+.005end ifif multikey(SC_Q) then RotPZ!=RotPZ!-.005end ifif multikey(SC_E) then RotPZ!=RotPZ!+.005end ifLocate 1,1:Print RotPX!Locate 2,1:Print RotPY!Locate 3,1:Print RotPZ!Loop Until Inkey$=" "ENDSUB Point3D (xA!, yA!, zA!, xP, yP, DST) DST = (LENS - zA!) xP=CenterX+(LENS * xA! / DST) yP=CenterY+(LENS * yA! / DST)END SUBSUB rotpt (x1!, y1!, z1!, rotx!, roty!, rotz!, nx!, ny!, nz!) DIM AS SINGLE rx,ry,rz rx = rotx! ry = roty!+90 rz = rotz!+90 'xrot nx1! = x1! ny1! = z1! * SIN(pi * rx) + y1! * COS(pi * rx) nz1! = z1! * COS(pi * rx) - y1! * SIN(pi * rx) 'yrot nx2! = nx1! * COS(pi * ry) - nz1! * SIN(pi * ry) ny2! = ny1! nz2! = nx1! * SIN(pi * ry) + nz1! * COS(pi * ry) 'zrot nx! = nx2! * COS(pi * rz) - ny2! * SIN(pi * rz) ny! = nx2! * SIN(pi * rz) + ny2! * COS(pi * rz) nz! = nz2! END SUBData -22,-203,-3Data 22,-203,-3Data -53,162,43Data 53,162,43Data 118,129,-19Data 154,162,-3Data -154,162,-3Data -118,129,-19Data -18,-142,10Data 18,-142,10Data 38,-51,11Data -38,-51,11Data 20,-51,43Data -20,-51,43Data 53,162,-3Data -53,162,-3Data 8,13Data 8,11Data 8,9Data 9,12Data 9,10Data 0,11Data 0,8Data 0,7Data 0,6Data 0,1Data 1,10Data 1,9Data 1,5Data 1,4Data 2,15Data 2,13Data 2,11Data 2,6Data 2,3Data 3,14Data 3,12Data 3,10Data 3,5Data 4,14Data 4,7Data 4,5Data 5,14Data 5,10Data 6,15Data 6,11Data 6,7Data 7,15Data 10,12Data 11,13Data 12,13Data 14,15Something like this:
'In the EEE loop:
GetPitchYawRoll RotX,RotY,RotZ,RealAngleX,RealAngleY,RealAngleZ
rotpt CoordX,CoordY,CoordZ,RealAngleX.RealAngleY.RealAngleZ,TempX,TempY,TempZ
'Where RealAngleX..Z get's their real rotation angle axis, and where TempX..Z gets a coordination of the offsetted rotational axises.
Really, how hard is this to solve?
Statistics: Posted by Guest — Sat Dec 03, 2005 1:06 am
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