Normal to Rotation Help

[practicing01]

Hello, I'm trying to orient an object based on a raycast result transformation. The following isn't working. Any help would be appreciated.

 

  %rayResult = %obj.doRaycast(10000.0, %rayMask);

  %objTarget = firstWord(%rayResult);
  %objPos = getWords(%rayResult, 1, 3);
  %objDir = getWords(%rayResult, 4, 6);
  %transform = MatrixCreateFromEuler(%objDir);

  %box_.setTransform(%transform);
  %box_.position = %objPos;

[irei1as]

I can't find the function "doRaycast" in my build so I'm going to assume you're using the one defined in

https://www.garagegames.com/community/forums/viewthread/118723

(You may want to check the console for "Unknown command doRaycast" error if you're not using that).

Your code seems correct.

I would try

  %rayResult = %obj.doRaycast(10000.0, %rayMask);

  %objTarget = firstWord(%rayResult);
  %objPos = getWords(%rayResult, 1, 3);
  %objDir = getWords(%rayResult, 4, 6);
  %transform = MatrixCreate(%objPos,%objDir);

  %box_.setTransform(%transform);

But that's basicalliy the same.

For testing you may want to also add to that

echo("Ray result=" SPC %rayResult);

To be sure the raycast was correct.

[practicing01]

I'm using the ShapeBase doRaycast. This is the result (wrong) http://img.ctrlv.in/img/16/05/20/573e5a8450fdf.png

[irei1as]

Alright, the code should work as this:

 

  %rayResult = %obj.doRaycast(10000.0, %rayMask);

  %objTarget = firstWord(%rayResult);
  %objPos = getWords(%rayResult, 1, 3);
  %objDir = getWords(%rayResult, 4, 6);

  %mat_rotx = MatrixCreateFromEuler( mAtan( mSqrt( %objDir.x*%objDir.x + %objDir.y*%objDir.y), %objDir.z) SPC "0 0");
  //%mat_localzrot = MatrixCreateFromEuler("0 0" SPC %localzrot);
  //%mat_rotx = MatrixMultiply(%mat_rotx,%mat_localzrot);
  %mat_rotz = MatrixCreateFromEuler("0 0" SPC mAtan(%objDir.x,%objDir.y));
  %transform = MatrixMultiply(%mat_rotz,%mat_rotx);

  %box_.setTransform(%transform);
  %box_.position = %objPos;

 

If you want to rotate the %box_ in the local z axis then remove the commenting and define %localzrot as the radian angle to rotate.

[practicing01]

Thanks irei1as! It worked. The code will probably help others in the future as well. This expert-level math is beyond lots of people. Game development requires engineer-level knowledge in a lot of aspects but if this engine wants to be newbie-friendly, rotations (other areas as well) need more helper functions.