Irrlicht Engine

Have you seen this before? It is from some of the bullet examples posted (not sure who gets the credit)

/// Converts a Bullet quaternion to an Irrlicht euler angle
void QuaternionToEuler(const btQuaternion &TQuat, btVector3 &TEuler)
{
btScalar W = TQuat.getW();
btScalar X = TQuat.getX ...

Hello

Thank you a lot for your answer. I appreciate that.
In fact I really like to use shaders for this to learn more about shaders so i can utilize them in my future projects as well.

I reviewed Irrlicht shader tutorial throughly and examined many GLES tutorials to have a better understanding ...

Hello

Thank you so much smso . That code is really helpful.
I will try to utilize that in my code.

hendu ,
your approach sound interesting and easy. But what i need to know is how to pass those parameters to Shader?

for example i want to draw a circle at point X,Y with radios R on one side of my ...

Hi
Thanks for your answer. i thought shader should be the right approach.

Can anyone give me a hint how to start doing it?
I know what shaders are and how they work in general, what i dont know is how to program this kind of shader and
how can i pass position of overlay texture that i want to show ...

Hello

Im working on a simulation program which contains a flat golf field.

I used a Box shape for ground with a green grass texture.

I want to high lite some areas on this box. for example a 2d circle around Pole or golf ball.
Take a look at these two screen-shots and you will understand what im ...

1) Dot product of two vectors through a common point = 0, gives you the perpendicular line.
2) From there on you can calculate separation point based on the desired distance.
3) After that just use the direction of the original vector to find the end point of both the mirrowed lines.

Goodluck ...

I guess your problem is the drawing. Please show the part where you draw the lines and make sure that you set up the proper transformation matrix before that.

Thank you for your answer. So you say my approach is correct? i mean Direction.rotateXZBy(30); really does what i wanted?

I dont think ...

Hi,
Isn't your next line end point is below?

End Point = Direction*500


yea, that was a typo, actually its like this :

End point = Node->getPosition()+ (Direction*500)


Actually the middle line (without angle) is working fine , im not sure how to apply an angle to a direction vector, problem ...

Hello

I am using Bullet physic in my simulation.
I have a cylinder at pos(0,0,0) and rotation(0,0,0)

Then i apply an angular velocity to Cylinder to make it rotating over Y axis :


btScalar AngVelocity = 1;
CylinderRigidBody->setAngularVelocity(btVector3(0,AngVelocity,0));


Everything is fine ...

Any suggestion how to calculate three lines directions?

Hello

I have a problem and i hope someone can help me out.

I have a cylinder in my scene, this cylinder can rotate around itself (over Y axis)

I want to draw 3 direct horizontal lines from center of this cylinder according to its rotation.
Each line make a 30 degree angle to previous one.(see the ...