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[Marek]

Three things are modified in this video to make the space ship fly better.
* Angle of space ship is limited to be between +/- 360 degrees
* Space ship is constrained to always be in the confinds of the window
* Limit the maximum speed of the ship

Note: When I was describing the damping that you can apply to the ship's motion when it hits a wall, I incorrectly showed how to implement this. When a collision occures you should change both the x and y component by your damping factor. In other words when there is a collision, take the new calculated velocity and multiply it by your damping factor, rather than multiplying just the one component of the velocity.

[Marek]

If you have not purchased the OpenGL Game Engine Development DVD or the VC++ 2005 Game Engine Source Code from the store then you will be missing a few functions in the Vector2 and Vector3 classes when you get to this point. I've included these functions below.


Put this inside your Vector3.h

Code:

//------------------------------------------------------------------------ // Name: operator*=(:) // Desc: multiply this vector by a scalar value: ie  Vector3*fValue // inline Vector3& Vector3::operator*=(const float &fValue) {    m_fX *= fValue;    m_fY *= fValue;    m_fZ *= fValue;    return *this; } //operator*= //------------------------------------------------------------------------ // Name: operator/=(:) // Desc: divide this vector by a scalar value: ie  Vector3/fValue // inline Vector3& Vector3::operator/=(const float &fValue) {    if (Math::isZero(fValue)) {       m_fX = 0;          m_fY = 0;       m_fZ = 0;    }    else {       float fValue_Inv = 1/fValue;       m_fX *= fValue_Inv;       m_fY *= fValue_Inv;       m_fZ *= fValue_Inv;    }    return *this; } //operator/= //------------------------------------------------------------------------ // Name: Zero(:) // Desc: Set value to (0,0,0) // inline void Vector3::Zero() {    m_fX = 0;    m_fY = 0;    m_fZ = 0; } //Zero //------------------------------------------------------------------------ // Name: Length2(:) // Desc: Return the length squared of this vector // inline float Vector3::Length2() const {    return (m_fX * m_fX +          m_fY * m_fY +          m_fZ * m_fZ); } //Length2

Put this inside your Vector2.h

Code:

//------------------------------------------------------------------------ // Name: operator*=(:) // Desc: multiply this vector by a scalar value: ie  Vector2*fValue // inline Vector2& Vector2::operator*=(const float &fValue) {    m_fX *= fValue;    m_fY *= fValue;    return *this; } //operator*= //------------------------------------------------------------------------ // Name: operator/=(:) // Desc: divide this vector by a scalar value: ie  Vector2/fValue // inline Vector2& Vector2::operator/=(const float &fValue) {    if (Math::isZero(fValue)) {       m_fX = 0;          m_fY = 0;    }    else {       float fValue_Inv = 1/fValue;       m_fX *= fValue_Inv;       m_fY *= fValue_Inv;    }    return *this; } //operator/= //------------------------------------------------------------------------ // Name: Zero(:) // Desc: Set value to (0,0) // inline void Vector2::Zero() {    m_fX = 0;    m_fY = 0; } //Zero //------------------------------------------------------------------------ // Name: Length2(:) // Desc: Return the length squared of this vector // inline float Vector2::Length2() const {    return (m_fX * m_fX +          m_fY * m_fY); } //Length2

[skilz80]

Yeah, Thank You for the code, and every thing works well so far, if I am missing anything else Ill either post it here or send you an email.