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POHLSL Point Light shader causing tiles to be shaded separately
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copied!<p>I've recently started learning HLSL after deciding that I wanted better lighting than what BasicEffect offered. After going through many tutorials, I found this and decided to learn from it: <a href="http://brooknovak.wordpress.com/2008/11/13/hlsl-per-pixel-point-light-using-phong-blinn-lighting-model/" rel="nofollow">http://brooknovak.wordpress.com/2008/11/13/hlsl-per-pixel-point-light-using-phong-blinn-lighting-model/</a></p> <p>It seems that the shader above doesn't work very well in my game though, because my game uses a tile based approach, which means multiple models in a grid-like formation.</p> <p>What happens is that each of my tiles gets shaded separately from the others. Please see this image for a visual reference: <a href="http://i.imgur.com/1Sfi2.png" rel="nofollow">http://i.imgur.com/1Sfi2.png</a> I understand that this is because each tile has it's own model and the shader doesn't take into account other models as it's executing on the meshes of a model.</p> <p>Now, for the question. How does one go about to shade all the tiles together? I understand that I may have to write a shader from scratch to accomplish this, but if anyone could give me some tips on how to achieve the effect I want, I'd really appreciate it.</p> <p>It's late so there's a possibility that I've forgotten something. If you need more information, please tell me and I'll add it.</p> <p>Thanks, Merigrim</p> <p><strong>EDIT:</strong></p> <p>Here is my code for drawing a model:</p> <pre class="lang-cs prettyprint-override"><code>public void DrawModel(Model model, Matrix modelTransform, Matrix[] absoluteBoneTransforms, Vector3 color, float alpha = 1.0f, Texture2D texture = null) { foreach (EffectPass pass in effect.CurrentTechnique.Passes) { foreach (ModelMesh mesh in model.Meshes) { foreach (ModelMeshPart part in mesh.MeshParts) { part.Effect = effect; Matrix world = absoluteBoneTransforms[mesh.ParentBone.Index] * modelTransform; effect.Parameters["World"].SetValue(absoluteBoneTransforms[mesh.ParentBone.Index] * modelTransform); effect.Parameters["View"].SetValue(camera.view); effect.Parameters["Projection"].SetValue(camera.projection); effect.Parameters["CameraPos"].SetValue(camera.cameraPosition); Vector3 lookAt = camera.cameraPosition + camera.cameraDirection; effect.Parameters["LightPosition"].SetValue(new Vector3(lookAt.X, 1.0f, lookAt.Z - 5.0f)); effect.Parameters["LightDiffuseColor"].SetValue(new Vector3(0.45f, 0.45f, 0.45f)); effect.Parameters["LightSpecularColor"].SetValue(new Vector3(0.45f, 0.45f, 0.45f)); effect.Parameters["LightDistanceSquared"].SetValue(40.0f); effect.Parameters["DiffuseColor"].SetValue(color); effect.Parameters["AmbientLightColor"].SetValue(Color.Black.ToVector3()); effect.Parameters["EmissiveColor"].SetValue(Color.White.ToVector3()); effect.Parameters["SpecularColor"].SetValue(Color.White.ToVector3()); effect.Parameters["SpecularPower"].SetValue(10.0f); if (texture != null) { effect.Parameters["DiffuseTexture"].SetValue(texture); } mesh.Draw(); } } pass.Apply(); } } </code></pre>

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