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Thread: Puting a square movieclip inside 4 3d points

  1. #1
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    Arrow Puting a square movieclip inside 4 3d points

    There are four 3d points of a square and I want my movieclip to be that square. I can easliy calculate the center position but I can't calculate the rotationX,rotationY and rotationZ of the movieclip. Is there any other way?

    Can you please help me?

  2. #2
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    It will be very hard to calculate those values from 4 points. You should use drawTriangles method and put all 4 coordinates - flash will display it properly.

  3. #3
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    I also tried it but when the square goes in front of the screen or somehow calculations go wrong: http://www.swfcabin.com//swf-files/1309001022.swf

  4. #4
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    You have four points:
    AB
    CD
    You draw two triangles and it looks like both has coordinates ACD and CDB (should be DBA). Could be also problem with texture coordinates.
    Esquimo - Flash 3D

  5. #5
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    Both things are correct it has something to do with the T values (focalLength/(focalLength + z).

    t value of the upper left corner goes like this:

    0.4688877681361125
    0.4980771996419072
    0.5312287312353987
    0.5691950758138303
    0.6130925971297903
    0.6644117319549809
    0.7251879822366941
    0.7982761394278287
    0.8878085868407571
    0.9999999999999991
    1.144647922926617
    1.3381495096442009
    1.6101835787010428
    2.020572753703822
    2.710577936530085
    4.112973857744241
    8.505448511997727
    -129.51869848202483 ********* this is where it starts to happen
    -7.53542481599268
    -3.885802291436719
    -2.620512758445331
    -1.9784685303563248
    -1.590281169788556
    -1.3303150505932697
    -1.14409921962679
    -1.00418983659365
    -0.8952573325826455
    -0.8080664129552478
    -0.7367213823408194
    -0.6772817626492885
    -0.6270138389008615
    -0.5839615639197313

  6. #6
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    Try to move whole object in z axis (to be sure that z coordinates are always positive). If it does not help please write some you formulas which you use.
    Esquimo - Flash 3D

  7. #7
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    yes that solved the problem but I want to make a skybox like http://blog.jidolstar.com/574 . I don't know how can I make it without negative z values.

  8. #8
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    Try to modify your perspective projection formula and use abs(w) instead of w.
    Esquimo - Flash 3D

  9. #9
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    Thank you so much! problem is solved. here is my latest 3d game if you want to see: http://www.games121.com/2011/02/monster-chamber.html

  10. #10
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    I realised that it is impossible to make a skybox with abs. It doesn't look real no matter what the focallength is.

  11. #11
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    Give us url to skybox, maybe we can improve it a bit ;-)
    Esquimo - Flash 3D

  12. #12
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    http://www.mediafire.com/?i4mo3ncbit1n45s

    remove

    z1+=1000
    z2+=1000
    z3+=1000
    z4+=1000

    lines to see it with negative z values.

  13. #13
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    Sorry but currently I do not have flash installed. I can check only flex applications.
    Esquimo - Flash 3D

  14. #14
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    I solved the problem and made an skybox with away3d. I am going to use away3d only for the skybox in my game. I can rotate the view in the X and Y axises using camera.tilt and camera.pan BUT I have to rotate the view in the Z axis and Y axis (It's a flight game). scene.rotationZ is no good when the camera is tilted.

    I am trying to solve this problem for nearly a day. Is there a way to rotate the camera in the Z axis? Maybe you can help me.

  15. #15
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    I do not know Away3d, but normally you can change rotation in the Z axis by changing up vector of camera.
    Esquimo - Flash 3D

  16. #16
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    lookat(vec1,vec2) worked. thank you

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