Translation

This topic contains 2 replies, has 2 voices, and was last updated by  aicha11 3 years, 6 months ago.

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  • #31681

    aicha11
    Member

    I want to move a wheelchair with my keyboard. the right and left key for rotation and the down , up key for translation(advance and back)
    the problem is when I rotate the wheelchair then i translated it for advancing , it is moved in inclined way
    for example the initial position is in the center of home and its advanced vector is left to right if we rotate it 180° the advaced vector should be from right to left but form me it still left to right 🙁
    i hope that you understand my problem
    please any idea?

    #38658

    dgu
    Member

    i am not sure i understand 🙂
    but if you are in the right coordinate system that should not happend, and when you say left to right around z or y axe ?
    is the screen alreadyy rotated ? did you take that into account ?
    bool bRotate = PVRShellGet(prefIsRotated) && PVRShellGet(prefFullScreen);
    because it will change the projection matrix
    // Calculate the projection matrix
    m_mProjection = PVRTMat4::PerspectiveFovRH(fFOV, (float)PVRShellGet(prefWidth)/(float)PVRShellGet(prefHeight), CAM_NEAR, CAM_FAR, PVRTMat4::OGL, bRotate);

    then your world coordinate should be just rotated :
    mWorld = PVRTMat4::RotationY(ANGLE)

    regards
    david

    #38659

    aicha11
    Member

    in the begining the wheelchair was translated according to the Z axe then when I rotate it with angle =45° then I translated it, the correct answer is to consider this angle and advance but for me it was translated according to angle =0° (the initial position) i mean that it translate in inclined way

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