# DX11 convert code from dx11 to dx9

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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

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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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Introduction:
In general my questions pertain to the differences between floating- and fixed-point data. Additionally I would like to understand when it can be advantageous to prefer fixed-point representation over floating-point representation in the context of vertex data and how the hardware deals with the different data-types. I believe I should be able to reduce the amount of data (bytes) necessary per vertex by choosing the most opportune representations for my vertex attributes. Thanks ahead of time if you, the reader, are considering the effort of reading this and helping me.
I found an old topic that shows this is possible in principal, but I am not sure I understand what the pitfalls are when using fixed-point representation and whether there are any hardware-based performance advantages/disadvantages.
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The Actual Post:
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