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PODirect3D 11 WorldViewProjection Matrix Transformation Not Working
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copied!<p>I have a simple square I'm drawing in 3D space using Direct3D 11 and SlimDX, with the following coordinates (I know it renders)</p> <pre><code>0,0,0.5 0,0.5,0.5 0.5,0.5,0.5 0.5,0,0.5 </code></pre> <p>I have a camera class that handles camera movement by applying matrix transformations to the viewmatrix. e.g. Camera.MoveForward(float x) moves the camera forward by x. It also holds the View and Projection matrices. I instantiate them using the following code:</p> <pre><code>Matrix view = Matrix.LookAtLH( new Vector3(0f, 0f, -5f), new Vector3(0f, 0f, 0f), new Vector3(0f, 1f, 0f)); Matrix projection = Matrix.PerspectiveFovLH( (float)Math.PI/2, WINDOWWIDTH/WINDOWHEIGHT, 0.1f, 110f); </code></pre> <p>The world matrix is set to the identity matrix.</p> <p>In my shader code I transform my coordinates using the following code:</p> <pre><code>PS_IN VS(VS_IN input) { PS_IN output = (PS_IN)0; output.pos = mul( input.pos, WorldViewProjection ); output.col = float4(1,1,1,1); return output; } </code></pre> <p>Where WorldViewProjection is set in my code using the following:</p> <pre><code>Matrix worldview = Matrix.Multiply(world, camera.ViewMatrix); Matrix worldviewprojection = Matrix.Multiply(worldview, camera.ProjectionMatrix); </code></pre> <p>I know the camera class's transformations are working as it's old code I wrote for an MDX application which worked fine, however when this runs I see my square, and moving forwards and backwards works just fine, but moving left and right seems to rotate the square around the Y (up) axis instead of translating it, moving up and down has a similar effect, rotating instead about the X (horizontal) axis.</p> <p>For reference, the camera movement functions:</p> <pre><code>public void MoveRight(float distance) { position.Z += (float)(Math.Sin(-angle.Y) * -distance); position.X += (float)(Math.Cos(-angle.Y) * -distance); updateViewMatrix(); } public void MoveForward(float distance) { position.X += (float)(Math.Sin(-angle.Y) * -distance); position.Z += (float)(Math.Cos(-angle.Y) * -distance); updateViewMatrix(); } public void MoveUp(float distance) { position.Y -= distance; updateViewMatrix(); } private void updateViewMatrix() { ViewMatrix = Matrix.Translation(position.X, position.Y, position.Z) * Matrix.RotationY(angle.Y) * Matrix.RotationX(angle.X) * Matrix.RotationZ(angle.Z); } </code></pre>

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