Change in VEX code from H12.5 to H13?

[dszs]

Hi guys,

             I have a vex based flocking system that was done in H11 and now I would like to migrate to H13, however I get a compliation when I ran it in H13:

steerSolver:215:23-30: Error 1029: Invalid type in explicit cast: void to matrix
steerSolver:215:32-37: Error 1066: No matching function for rotate(matrix; float; vector). Candidates are: void rotate(matrix3 &; float; vector), void rotate(matrix &; float; vector)
steerSolver:216:31-33: Warning 2018: Using uninitialized variable: rot
steerSolver:261:32-39: Error 1029: Invalid type in explicit cast: void to matrix
steerSolver:261:41-46: Error 1066: No matching function for rotate(matrix; float; vector). Candidates are: void rotate(matrix3 &; float; vector), void rotate(matrix &; float; vector)
steerSolver:263:43-47: Warning 2018: Using uninitialized variable: newUp
steerSolver:269:9-20: Error 1066: No matching function for addattribute(string; vector; int). Candidates are: void addattribute(string; matrix3; ... ), void addattribute(string; matrix; ... ), void addattribute(string; float; ... ), void addattribute(string; int; ... ), void addattribute(string; vector4; ... ), void addattribute(string; string; ... ), void addattribute(string; vector; ... ), void addattribute(string; float[]; int; ... )

I tested it in H12.5 and it was working. Is there a major change in H13 that causes this? Thanks for taking your time to answer!

 

-Darren

[edward]

How do the offending lines look like? I think the type system in VEX has been made stricter, and some functions might have changed signatures slightly.

[dszs]

Hi Edward, sorry for the late reply! Didn't have access to my code as it was in the office!

 

The offending line looks like this :

    // contrain the turn angle in this simulation step
    float turnAngle = getAngleBetween(forward(), newVel);
    if (turnAngle > radians(maxTurn)) {
        turnAngle = radians(maxTurn);
        matrix identM = ident();
        matrix rot =  (matrix) rotate( identM, radians(maxTurn), axis);
        turnVel = forward() * rot;
                  
        // new vel direction is turnVel
        //newVel = turnVel * length(newVel);
        
    }

The weird thing is, in H12.5, it reports an error but it is still able to execute

 

[rayman]

rotate() returns void, so try something like this:

    // contrain the turn angle in this simulation step
    float turnAngle = getAngleBetween(forward(), newVel);
    if (turnAngle > radians(maxTurn)) {
        turnAngle = radians(maxTurn);
        matrix identM = ident();
        rotate( identM, radians(maxTurn), axis);
        turnVel = forward() * identM;
                  
        // new vel direction is turnVel
        //newVel = turnVel * length(newVel);
        
    }

[dszs]

Hi rayman, it works! Thanks.

Can I ask another question?

There is another section which have the same problem. I already tried with the above method but it still returns the same error

  
         vector newUp =  up() * rotate(upRot, turnAngle, forward());
        //vector newUp = up() + steer * (1-upInertia);
        newUp = (targetUp * (upInertia) + newUp  ) / 2;
        setUp( cross(cross( forward(), newUp ), forward()) );
    
        vector heading = {0,0,0};
        //import("heading", heading, 0);
        heading = normalize( (normalize(oldForward) + turnVel) / 2 );
        addattribute("heading", heading, 0);
    }

Is there something I did wrong?
 

Edited March 16, 2015 by dszs

[magneto]

It means return "nothing"

 

http://en.wikipedia.org/wiki/Void_type

[dszs]

Ahhh thanks Ryan, that explains why it didn't work

[dszs]

Ah nvm! I found out the mistake I made alr. I should have let the rotate modify the matrix before letting it modified matrix multiply with the up(). Thanks guy for your help!

[lhgou11]

Hi Dszs !!   I also met the same problem , I still confuse why the code cannot be compiled, could you paste the result you have modified of this part:

[fathom]

rotate doesn't return a value, it updates the matrix you supply as the first value.  you need to split up that line to first rotate your matrix and then multiply your up vector by your rotated matrix.

 

rotate(upRot, turnAngle, forward());

vector newUp = up() * upRot;

[dszs]

Hi Dszs !!   I also met the same problem , I still confuse why the code cannot be compiled, could you paste the result you have modified of this part:

QQ图片20151007181426.png

 

Hi,

Sorry for the late reply! Hope it's not too late to clarify stuff. I don't have the original code anymore. But what fathom mentioned is exactly what you should be doing 

 

rotate doesn't return a value, it updates the matrix you supply as the first value.  you need to split up that line to first rotate your matrix and then multiply your up vector by your rotated matrix.

 

rotate(upRot, turnAngle, forward());

vector newUp = up() * upRot;

 

- Darren