---
title: "render(atTime:arguments:)"
framework: quartz
role: symbol
role_heading: Instance Method
path: "quartz/qcrenderer/render(attime:arguments:)"
---

# render(atTime:arguments:)

Renders a frame of a composition at the specified time.

## Declaration

```swift
func render(atTime time: TimeInterval, arguments: [AnyHashable : Any]!) -> Bool
```

## Parameters

- `time`: The time, in seconds, at which to render a composition frame. The time must be a positive value or zero.
- `arguments`: An optional dictionary that can have any of the entries defined in doc://com.apple.quartz/documentation/Quartz/rendering-arguments.

## Return Value

Return Value true if successful.

## Discussion

Discussion You need to call this method each time you want to render a frame of the composition. All OpenGL states are preserved  except the following: States defined by GL_CURRENT_BIT Textures on each unit and the environment mode Matrix mode If you are using double buffers, keep in mind that the renderAtTime:arguments: method does not swap the front and back buffers of the OpenGL context. You must perform the swap yourself by calling the OpenGL command flushBuffer on the context associated with the renderer. If you are interleaving OpenGL code with rendering of a composition, make sure that the OpenGL context is current. If you are using the NSOpenGLContext class, call the makeCurrentContext() method prior to rendering. If you are using the CGL API, call the function CGLSetCurrentContext(_:).