[SOLVED] Questions: Cameras... 3ds Max

[iblues1976]

Hi,

I have some questions. First, when I export cameras from 3ds max using OgreMax, I never see information about the lookat... I do see the field of view angle, positions, rotations..
do you guys know why? is there a way to set that in 3ds max?

Code: Select all

<node name="Camera02">
            <position x="757.858" y="-1.14201e-005" z="-261.261" />
            <scale x="1" y="1" z="1" />
            <rotation qx="0.628293" qy="0.324419" qz="-0.324419" qw="0.628293" />
            <camera name="Camera02" fov="0.713667">
                <rotation qx="-0.707107" qy="-0" qz="-0" qw="0.707107" />
                <clipping near="1" far="5000" />
            </camera>
            <trackTarget nodeName="Camera02.Target">
                <localDirection x="0" y="-1" z="0" />
            </trackTarget>
        </node>

another question... does it make a difference for ogre if I set the camera in 3ds as "Target" or "Free"

and the last question: What is the difference between

Code: Select all

mCameraMan = new OgreBites::SdkCameraMan(mCamera);

and (setting the camera from the viewport)

Code: Select all

m_pViewport->setCamera(m_Camera);

I read that SDKCameraMan is better?

thanks,
Francisco

[Kojack]

Cameras don't have a lookat value.
You can tell an ogre camera to look at a position, but what that actually does is change the orientation (rotation). The actual lookat position you provide is never stored in the camera.

The OgreBites SdkCameraMan is part of the sample browser. It's not part of ogre itself.
Not much more I can say about it, I've never used it.

[iblues1976]

Hi,

how can I use the rotation

Code: Select all

<rotation qx="0.628293" qy="0.324419" qz="-0.324419" qw="0.628293" />

to calculate the look at value then?

thanks,
Francisco

[Kojack]

That rotation value is a quaternion. If you multiply a quaternion by the vector [0,0,-1] you'll get a vector pointing in the direction of the camera. Somewhere along that vector is where you are looking (there's no explicit lookat point, it could be anywhere along that vector). Ogre's camera knows the direction you are looking, but not how far.

[iblues1976]

Thank you!!!!