API Reference > imodeljs-frontend > Rendering Rendering Classes for rendering the contents of views. Classes Name Description DecorateContext Provides context for a ViewportDecorator to add Decorations to be rendered within a Viewport. Decorations A set of RenderGraphics and CanvasDecorations produced by Tools and Decorators, used to decorate the contents of a Viewport. DynamicsContext Provides context for an InteractiveTool to display decorations representing its current state. EmphasizeElements An implementation of EmphasizeElements.FeatureOverrideProvider for emphasizing selected elements through simple color/transparency appearance overrides. GraphicBranch A node in a scene graph. GraphicBuilder Provides methods for constructing a RenderGraphic from geometric primitives. RenderClipVolume An opaque representation of a clip volume applied to geometry within a Viewport. RenderContext Provides context for producing RenderGraphics for drawing within a Viewport. RenderGraphic Abstract representation of an object which can be rendered by a RenderSystem. RenderGraphicOwner A graphic that owns another graphic. RenderSystem A RenderSystem provides access to resources used by the internal WebGL-based rendering system. Scene Holds a collection of objects comprising the scene to be drawn by a Viewport's. SceneContext Context used to create the scene to be drawn in a Viewport. Enumerations Name Description FeatureOverrideType Options for overriding element appearance. GraphicType Describes the type of a GraphicBuilder, which defines the coordinate system in which the builder's geometry is defined and UniformType The underlying data types that can be used for uniform variables in screen-space effect shaders. VaryingType The underlying data types that can be used for varying variables in screen-space effect shaders. Global Functions Name Description canvasToImageBuffer Create an ImageBuffer in the specified format with the same dimensions and contents as a canvas. canvasToResizedCanvasWithBars Resize a canvas to a desired size. extractImageSourceDimensions Extract the dimensions of the jpeg or png data encoded in an ImageSource. getCenteredViewRect Determine the maximum ViewRect that can be fitted and centered in specified ViewRect given a required aspect ratio. getCompressedJpegFromCanvas Produce a jpeg compressed to no more than specified bytes and of no less than specified quality. getImageSourceFormatForMimeType Get the ImageSourceFormat corresponding to the mime type string, or undefined if the string does not identify a supported ImageSourceFormat. getImageSourceMimeType Get a string describing the mime type associated with an ImageSource format. imageBufferToBase64EncodedPng Converts the contents of an ImageBuffer to PNG format. imageBufferToCanvas Create a canvas element with the same dimensions and contents as an image buffer. imageBufferToPngDataUrl Produces a data url in "image/png" format from the contents of an ImageBuffer. imageElementFromImageSource Extract an html Image element from a binary jpeg or png. imageElementFromUrl Create an html Image element from a URL. openImageDataUrlInNewWindow Open an image specified as a data URL in a new window or tab. Beta tryImageElementFromUrl Try to create an html Image element from a URL. Interfaces Name Description AppearanceOverrideProps JSON representation of an appearance override in an EmphasizeElementsProps. BatchOptions Options used when constructing a Batch - that is, a RenderGraphic with an associated FeatureTable describing individual Features within the CanvasDecoration A Decoration that is drawn onto the EmphasizeElementsProps JSON representation of an EmphasizeElements. GraphicBranchOptions Options passed to RenderSystem.createGraphicBranch. ParticleCollectionBuilderParams Parameters used to construct a ParticleCollectionBuilderParams.ParticleCollectionBuilder. ParticleProps Describes a particle to to add to a particle collection via ParticleCollectionBuilder.addParticle. RenderSystem.Options Options passed to IModelApp.supplyRenderSystem to configure the RenderSystem on startup. RenderSystemDebugControl An interface optionally exposed by a RenderSystem that allows control of various debugging features. Beta ScreenSpaceEffectBuilder An interface used to construct and register with the IModelApp.renderSystem a custom screen-space effect. ScreenSpaceEffectBuilderParams Parameters used to create a ScreenSpaceEffectBuilder. ScreenSpaceEffectContext Context passed to ScreenSpaceEffectBuilder.shouldApply. ScreenSpaceEffectSource The GLSL implementation of the effect produced by a ScreenSpaceEffectBuilder, to be integrated into a complete shader program. Uniform Represents a uniform variable in a shader program used by a custom screen-space effect, providing methods for setting the current value of the uniform. UniformArrayParams Parameters used to define an array of uniform variables for a ScreenSpaceEffectBuilder's shader program. UniformContext Context supplied to UniformParams.bind. UniformParams Parameters used to define a uniform variable for a ScreenSpaceEffectBuilder's shader program. Namespaces Name Description FeatureSymbology Contains types that enable an application to customize how Features are drawn within a Viewport. ParticleCollectionBuilder Pixel Describes aspects of a pixel as read from a Viewport. Type Aliases Name Description CanvasDecorationList An array of CanvasDecorations. GraphicList An array of RenderGraphics. Last Updated: 30 April, 2021