History: Setting a vector's length

Source of version: 4 (current)

!!Overview of the problem
You are writing some code that uses OGRE's great ''Ogre::Vector2'', ''Ogre::Vector3'' and ''Ogre::Vector4'' classes and then you need to arbitrarily set the length of the vector you are using.

You look at OGRE's documentation, but then you scream out loud when you realize that OGRE does not define any function to set the length of a vector. As you are not a math genius (just as me) and/or you are never sure about yourself (just as mee too), you are desperate as you see that looking for some code in the forums gives you everything except what you are looking for.

!!The solution
The solution is really simple, just create a small function in your program, that takes a ''Ogre::Vector3'' pointer as the first parameter and a ''Ogre::Real'' as the second parameter, and you are done!

{CODE(wrap="1", colors="c++")}void setVectorLength(Ogre::Vector3 *vector, const Ogre::Real newLength)
{
     vector->normalise();
     (*vector) *= newLength;
}{CODE}

You could write overloaded functions for ''Ogre::Vector2'' and ''Ogre::Vector4'' as well.

{CODE(wrap="1", colors="c++")}void setVectorLength(Ogre::Vector2 *vector, const Ogre::Real newLength)
{
     vector->normalise();
     (*vector) *= newLength;
}
 
void setVectorLength(Ogre::Vector4 *vector, const Ogre::Real newLength)
{
     vector->normalise();
     (*vector) *= newLength;
}{CODE}

History: Setting a vector's length

Source of version: 4 (current)

Search by Tags

Latest Changes

Search

Online Users