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# convert code from dx11 to dx9

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### #1Anddos  Members

Posted 09 December 2012 - 01:47 PM

can anyone do me a favour and convert this code to directx 9 , i dont understand dx 11 at all and need to get this code working in a dx9 application , thanks alot.

void MoveChar(double time, XMVECTOR&amp; destinationDirection, XMMATRIX&amp; worldMatrix)
{
// Normalize our destinated direction vector
destinationDirection = XMVector3Normalize(destinationDirection);
// If character is currently facing the complete opposite direction as the desired direction
// they will turn around VERY slowly, so we want to make sure they turn around at a normal speed
// by making the old character direction not the exact opposite direction as the current character
// position. Try commenting out the next two lines to see what i'm talking about
if(XMVectorGetX(XMVector3Dot(destinationDirection, oldCharDirection)) == -1)
oldCharDirection += XMVectorSet(0.02f, 0.0f, -0.02f, 0.0f);
// Get our current characters position in the world, from it's world matrix
charPosition = XMVectorSet(0.0f, 0.0f, 0.0f, 0.0f);
charPosition = XMVector3TransformCoord(charPosition, worldMatrix);
// Rotate our character smoothly when changing direction (from the GPG series)
float destDirLength = 10.0f * frameTime;  // Change to the speed you want your character to rotate. This uses the game timer from an earlier lesson
// The larget this value, the faster the character rotates
currCharDirection = (oldCharDirection) + (destinationDirection * destDirLength); // Get the characters direction (based off time, old position, and desired
// direction), by adding together the current direction and the old direction
// to get vector that smoothly turns from oldCharDir to denstinationDirection
currCharDirection = XMVector3Normalize(currCharDirection);  // Normalize the characters current direction vector
// Here we find the angle of our character (angle between current direction and world's normal vector), used so that we can actually rotate
// our characters world matrix. The three lines below, together, find the angle between 0 PI and 2 PI (360 degrees, and technically, it returns
// the degrees in radians from -1 PI to 1 PI, but that has the same effect as 0 PI to 2 PI) between two vectors.
// XMVector3AngleBetweenNormals returns an angle between two vectors, but always a positive result between
// 0 and 1 PI. Which means, it doesn't tell us which half of the 2 PI degrees that are possible. So, we have the next if statement below,
// which crosses the current characters direction and the worlds forward (0,0,1), which should give us the y axis vector (assuming that our character
// rotates on the xz plane). We check to see if the y vector is positive ( > 0.0f), and if it is, we set the characters direction angle to be
// the opposite of what it currently is, giving us the result in -1 PI to 1 PI.
float charDirAngle = XMVectorGetX(XMVector3AngleBetweenNormals( XMVector3Normalize(currCharDirection), XMVector3Normalize(DefaultForward)));
if(XMVectorGetY(XMVector3Cross(currCharDirection, DefaultForward)) > 0.0f)
charDirAngle = -charDirAngle;
// Now we update our characters position based off the frame time, his old position, and the direction he is facing
float speed = 15.0f * frameTime;
charPosition = charPosition + (destinationDirection * speed);
// Update characters world matrix
XMMATRIX rotationMatrix;
Scale = XMMatrixScaling( 0.25f, 0.25f, 0.25f );
Translation = XMMatrixTranslation(XMVectorGetX(charPosition), 0.0f, XMVectorGetZ(charPosition) );
rotationMatrix = XMMatrixRotationY(charDirAngle - 3.14159265f);  // Subtract PI from angle so the character doesn't run backwards
worldMatrix = Scale * rotationMatrix * Translation;
// Set the characters old direction
oldCharDirection = currCharDirection;
// Update our animation
float timeFactor = 1.0f; // You can speed up or slow down time by changing this
UpdateMD5Model(NewMD5Model, time*timeFactor, 0);
}

void UpdateCamera()
{
// Rotate target around camera
/*camRotationMatrix = XMMatrixRotationRollPitchYaw(camPitch, camYaw, 0);
camTarget = XMVector3TransformCoord(DefaultForward, camRotationMatrix );
camTarget = XMVector3Normalize(camTarget);*/
/*XMMATRIX RotateYTempMatrix;
RotateYTempMatrix = XMMatrixRotationY(camYaw);
// Walk
camRight = XMVector3TransformCoord(DefaultRight, RotateYTempMatrix);
camForward = XMVector3TransformCoord(DefaultForward, RotateYTempMatrix);
camUp = XMVector3Cross(camForward, camRight);*/
/*// Free Cam
camRight = XMVector3TransformCoord(DefaultRight, camRotationMatrix);
camForward = XMVector3TransformCoord(DefaultForward, camRotationMatrix);
camUp = XMVector3Cross(camForward, camRight);*/
/*camPosition += moveLeftRight*camRight;
camPosition += moveBackForward*camForward;
moveLeftRight = 0.0f;
moveBackForward = 0.0f;
camTarget = camPosition + camTarget;*/
// Third Person Camera
// Set the cameras target to be looking at the character.
camTarget = charPosition;
// This line is because this lessons model was set to stand on the point (0,0,0) (my bad), and we
// don't want to just be looking at the models feet, so we move the camera's target vector up 5 units
camTarget = XMVectorSetY(camTarget, XMVectorGetY(camTarget)+5.0f);
// Unlike before, when we rotated the cameras target vector around the cameras position,
// we are now rotating the cameras position around it's target (which is the character)
// Rotate camera around target
camRotationMatrix = XMMatrixRotationRollPitchYaw(-camPitch, camYaw, 0);
camPosition = XMVector3TransformNormal(DefaultForward, camRotationMatrix );
camPosition = XMVector3Normalize(camPosition);
// Set our cameras position to rotate around the character. We need to add 5 to the characters
// position's y axis because i'm stupid and modeled the character in the 3d modeling program
// to be "standing" on (0,0,0), instead of centered around it ;) Well target her head here though
camPosition = (camPosition * charCamDist) + camTarget;
// We need to set our cameras forward and right vectors to lay
// in the worlds xz plane, since they are the vectors we will
// be using to determine the direction our character is running
camForward = XMVector3Normalize(camTarget - camPosition); // Get forward vector based on target
camForward = XMVectorSetY(camForward, 0.0f); // set forwards y component to 0 so it lays only on
// the xz plane
camForward = XMVector3Normalize(camForward);
// To get our camera's Right vector, we set it's x component to the negative z component from the
// camera's forward vector, and the z component to the camera forwards x component
camRight = XMVectorSet(-XMVectorGetZ(camForward), 0.0f, XMVectorGetX(camForward), 0.0f);
// Our camera does not "roll", so we can safely assume that the cameras right vector is always
// in the xz plane, so to get the up vector, we just get the normalized vector from the camera
// position to the cameras target, and cross it with the camera's Right vector
camUp =XMVector3Normalize(XMVector3Cross(XMVector3Normalize(camPosition - camTarget), camRight));
camView = XMMatrixLookAtLH( camPosition, camTarget, camUp );
}


Edited by Anddos, 09 December 2012 - 01:48 PM.

### #2kauna  Members

Posted 09 December 2012 - 01:53 PM

Where is the D3D 11 part?

The code is just about vector manipulation. MSDN has quite good documentation of each function. I think that those functions should work with D3D9 also.

Cheers!

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