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September 3, 2025 22:24
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TargetRender for Stride game engine
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| // add this component to Entity, which must be marked as target | |
| using Stride.Core; | |
| using Stride.Engine; | |
| [DataContract] | |
| public class TargetComponent : EntityComponent {} |
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| // Based on Stride Community Toolkit Example #9 | |
| // https://github.com/stride3d/stride-community-toolkit/blob/08218340fb99b6d994e160d2d0af05bcce43fab1/examples/code-only/Example09_Renderer/MyCustomSceneRenderer.cs | |
| using Stride.Core.Mathematics; | |
| using Stride.Engine; | |
| using Stride.Graphics; | |
| using Stride.Rendering; | |
| using Stride.Rendering.Compositing; | |
| namespace BlurUI.CustomRenderer | |
| { | |
| public class TargetRenderer : SceneRendererBase, ISharedRenderer | |
| { | |
| public Texture TargetTexture; | |
| private SpriteBatch _spriteBatch; | |
| private Scene _scene; | |
| private CameraComponent _camera; | |
| protected override void InitializeCore() | |
| { | |
| base.InitializeCore(); | |
| _spriteBatch = new SpriteBatch(GraphicsDevice); | |
| } | |
| protected override void DrawCore(RenderContext context, RenderDrawContext drawContext) | |
| { | |
| var graphicsCompositor = context.Tags.Get(GraphicsCompositor.Current); | |
| if (graphicsCompositor is null) return; | |
| _camera ??= context.GetCurrentCamera(); | |
| _scene ??= SceneInstance.GetCurrent(context).RootScene; | |
| if (_spriteBatch is null || _camera is null || _scene is null) return; | |
| var viewProjection = _camera.ViewProjectionMatrix; | |
| _spriteBatch.Begin( | |
| drawContext.GraphicsContext); | |
| foreach (var entity in _scene.Entities) | |
| { | |
| /* using Stride.Core; | |
| * using Stride.Engine; | |
| * [DataContract] | |
| * public class TargetComponent : EntityComponent {} | |
| * | |
| * can be add from code | |
| */ | |
| // Find object with TargetComponent | |
| if (entity.Components.Get<TargetComponent>() is null) continue; | |
| // original | |
| // var screenPosition = _camera.WorldToScreenPoint(ref entity.Transform.Position, GraphicsDevice); | |
| var worldPos = entity.Transform.Position; | |
| // Transform to clip space | |
| var clipPosition = Vector4.Transform(new Vector4(worldPos, 1f), viewProjection); | |
| if (clipPosition.W <= 0f) | |
| continue; // behind the camera | |
| // Perspective divide -> Normalized Device Coordinates (NDC) | |
| var inverseW = 1f / clipPosition.W; | |
| var normalizedDeviceCoordinatesX = clipPosition.X * inverseW; | |
| var normalizedDeviceCoordinatesY = clipPosition.Y * inverseW; | |
| var normalizedDeviceCoordinatesZ = clipPosition.Z * inverseW; | |
| // Clip test in NDC: x and y in [-1,1], z in [0,1] | |
| var outsideNdc = normalizedDeviceCoordinatesZ < 0f || normalizedDeviceCoordinatesZ > 1f || normalizedDeviceCoordinatesX < -1f || normalizedDeviceCoordinatesX > 1f || normalizedDeviceCoordinatesY < -1f || normalizedDeviceCoordinatesY > 1f; | |
| // culled | |
| if (outsideNdc) continue; | |
| // implementation | |
| // start | |
| Vector3.TransformCoordinate(ref worldPos, ref _camera.ViewProjectionMatrix, out Vector3 viewProject); | |
| Vector3.TransformCoordinate(ref worldPos, ref _camera.ViewMatrix, out Vector3 viewSpace); | |
| Vector3 result = new() | |
| { | |
| X = (viewProject.X + 1f) / 2f, | |
| Y = 1f - (viewProject.Y + 1f) / 2f, | |
| Z = viewSpace.Z + _camera.NearClipPlane, | |
| }; | |
| var windowSize = new Int2( | |
| drawContext.GraphicsDevice.Presenter.BackBuffer.Width, | |
| drawContext.GraphicsDevice.Presenter.BackBuffer.Height); | |
| Vector2 screenPosition = new() | |
| { | |
| X = result.X * windowSize.X, | |
| Y = result.Y * windowSize.Y | |
| }; | |
| // end | |
| // Draw a texture | |
| _spriteBatch.Draw( | |
| TargetTexture, | |
| new Rectangle( | |
| (int)screenPosition.X - TargetTexture.Width/2, // horizontal center of texture in center of object | |
| (int)screenPosition.Y - TargetTexture.Height/2, // vertical center of texture in center of object | |
| TargetTexture.Width, // rectangle width same as texture | |
| TargetTexture.Height), // rectangle height same as texture | |
| new(1.0f, 1.0f, 1.0f, 1.0f)); // Color | |
| } | |
| // End the SpriteBatch | |
| _spriteBatch.End(); | |
| } | |
| } | |
| } |
Author
w0wca7a
commented
Sep 3, 2025
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