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POXNA spritebatch and primative using different axis with same effect
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  1. POXNA spritebatch and primative using different axis with same effect
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    copied!<p>I am developing a side scroller game using monogame 3.0 (XNA-C#). I am using a TriangleStrip to draw the ground and a spritebatch to draw a fence. I want the fence to be on top of the ground but it seems to be using a different axis (negative instead of positive). In order to align things up I need to flip the fence and use a negative x and y. Both the sprite and the primitive are using the same view matrix and project.</p> <p>Why is the spritebatch need a negative axis while the primitive is using a positive one when they are using the same matrixes? </p> <pre class="lang-cs prettyprint-override"><code>protected override void Initialize() { viewMatrix = Matrix.CreateLookAt(new Vector3(0, 0, 1), Vector3.Zero, new Vector3(0,1, 0)); projectionMatrix = Matrix.CreateOrthographicOffCenter(0,GraphicsDevice.Viewport.Width, 0, GraphicsDevice.Viewport.Height, 0f, 200f) *Matrix.CreateScale(new Vector3(.5f, .5f, 1f)); GraphicsDevice.RasterizerState.CullMode = CullMode.None; _groundBasicEffect = new BasicEffect(GraphicsDevice); _groundBasicEffect.View = viewMatrix; _groundBasicEffect.Projection = projectionMatrix; _groundBasicEffect.VertexColorEnabled = true; _groundBasicEffect.World = world; _fenceBasicEffect = new BasicEffect(GraphicsDevice); _fenceBasicEffect.View = Matrix.CreateLookAt(new Vector3(0, 0, 1), Vector3.Zero, new Vector3(0,1, 0)); _fenceBasicEffect.Projection = projectionMatrix; _fenceBasicEffect.TextureEnabled = true; _fenceBasicEffect.World = world; base.Initialize(); } protected override void LoadContent() { _spriteBatch = new SpriteBatch(GraphicsDevice); fenceTexture = this.Content.Load&lt;Texture2D&gt;(@"Fence1"); vertexData = new VertexPositionColor[8]; vertexData[0] = new VertexPositionColor(new Vector3(0, 0, 0), Color.Black); vertexData[1] = new VertexPositionColor(new Vector3(0, 400, 0), Color.Black); vertexData[2] = new VertexPositionColor(new Vector3(200, 0, 0), Color.Black); vertexData[3] = new VertexPositionColor(new Vector3(200, 400, 0), Color.Black); vertexData[4] = new VertexPositionColor(new Vector3(300, 0, 0), Color.Black); vertexData[5] = new VertexPositionColor(new Vector3(300, 430, 0), Color.Black); vertexData[6] = new VertexPositionColor(new Vector3(1200, 0, 0), Color.Black); vertexData[7] = new VertexPositionColor(new Vector3(1200, 430, 0), Color.Black); vertexBuffer = new VertexBuffer(GraphicsDevice, typeof(VertexPositionColor), vertexData.Length, BufferUsage.None); vertexBuffer.SetData(vertexData); } protected override void Draw(GameTime gameTime) { GraphicsDevice.Clear(Color.White); GraphicsDevice.SetVertexBuffer(vertexBuffer); _groundBasicEffect.CurrentTechnique.Passes[0].Apply(); GraphicsDevice.DrawUserPrimitives&lt;VertexPositionColor&gt;(PrimitiveType.TriangleStrip, vertexData, 0, vertexData.Length -2); _spriteBatch.Begin(0, null, null, null, null, _fenceBasicEffect); _spriteBatch.Draw(fenceTexture, Vector2.Zero, new Rectangle(0, 0, 1130, 221), Color.White, 0, new Vector2(0, 200), 1, SpriteEffects.None, 0); _spriteBatch.End(); base.Draw(gameTime); } </code></pre> <p><strong>How it looks...</strong> <img src="https://i.stack.imgur.com/v3IEz.png" alt="How it looks"></p> <p><strong>How I expect it to look...</strong> <img src="https://i.stack.imgur.com/EcY9y.png" alt="How I expect it to look"></p> <p>In order to get this look I need to change the Draw of the fence to this...</p> <pre><code>_spriteBatch.Draw(fenceTexture, Vector2.Zero, new Rectangle(0, 0, 1130, 221), Color.White, 0, new Vector2(0, -400), 1, SpriteEffects.FlipVertically, 0); </code></pre>
 

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