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Static Public Member Functions

# MRenderView Class Reference
OpenMayaRender - API module for rendering

This reference page is linked to from the following overview topics: Overview of example plug-ins, Example C++ plug-in descriptions.

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## Detailed Description

Static class providing Render View API functions.

This class provides access to the Maya Render View. The class allows plugins to send image data to the Render View in the same way that the Maya renderer does. Either a "full render" or a "region render" can be performed. In a full render, the Render View expects to receive pixel data that fills the entire image, while a region render expects only updates to a specified image region.

Usage

To send an image to the Render View, use the following sequence of calls:

1. Call doesRenderEditorExist() to make sure that a Render View exists. If this returns false, then Maya is operating in batch mode.
2. Call setCurrentCamera() to specify the name of the camera that is being rendered.
3. Call startRender() or startRegionRender() to inform the Render View that you are about to start sending either a full image or a region update. When region rendering, the getRenderRegion() method can be used to retrieve the currently selected marquee region in the Render View.
4. The image or image region is sent to the Render View as a series of one or more tiles. For each tile, send the tile's image data using the updatePixels() method. Call the refresh() method to refresh the Render View after each tile has been sent.
5. Call endRender() to signal the Render View that all image data has been sent.

`#include <MRenderView.h>`

List of all members.

## Static Public Member Functions
static bool | doesRenderEditorExist ()
| Determines whether or not a Render View exists to receive image data.
static MStatus | setCurrentCamera (MDagPath &camera)
| Informs the render client of the camera that will be performing the rendering.
static MStatus | getRenderRegion (unsigned int &left, unsigned int &right, unsigned int &bottom, unsigned int &top)
| Retrieves the currently selected Render Region in Maya's Render View.
static MStatus | startRender (unsigned int width, unsigned int height, bool doNotClearBackground=false, bool immediateFeedback=false)
| Informs the Render View that a full image render is about to begin.
static MStatus | startRegionRender (unsigned int imageWidth, unsigned int imageHeight, unsigned int regionLeft, unsigned int regionRight, unsigned int regionBottom, unsigned int regionTop, bool doNotClearBackground=false, bool immediateFeedback=false)
| Informs the Render View that a region render is about to begin.
static MStatus | updatePixels (unsigned int left, unsigned int right, unsigned int bottom, unsigned int top, RV_PIXEL *pPixels, bool isHdr=false, const unsigned int numberOfAOVs=0, const RV_AOV *const pAOVs=NULL)
| Sends a block of pixels to the Render View.
static MStatus | refresh (unsigned int left, unsigned int right, unsigned int bottom, unsigned int top)
| Requests that the Render View refresh the display of a particular region of the displayed image.
static MStatus | endRender ()
| Informs the Render View that the current render has completed.
static const char * | className ()
| Returns the name of this class.

## Member Function Documentation

bool doesRenderEditorExist | ( |  | ) | `[static]`

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Determines whether or not a Render View exists to receive image data.

If this function returns false, then Maya is currently running in batch mode, so it would be pointless to try to send data to the Render View.

Returns:
  - true if the Render View exists.
  - false otherwise.

Examples:
  renderViewInteractiveRenderCmd.cpp, renderViewRenderCmd.cpp, and renderViewRenderRegionCmd.cpp.

MStatus setCurrentCamera | ( | MDagPath & | currentCamera | ) | `[static]`

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Informs the render client of the camera that will be performing the rendering.

Parameters:

  [in] | currentCamera | Camera to be used in the render.

Returns:
  - MS::kSuccess Operation was successful.
  - MS::kFailure Operation failed because no Render View existed.

Examples:
  renderViewRenderCmd.cpp, and renderViewRenderRegionCmd.cpp.

MStatus getRenderRegion | ( | unsigned int & | left,
|  | unsigned int & | right,
|  | unsigned int & | bottom,
|  | unsigned int & | top
| ) |  | `[static]`

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Retrieves the currently selected Render Region in Maya's Render View.

The region extends from the bottom-left corner (left,bottom) to the upper-right corner (right,top) inclusive (i.e. the row y=top and column x=right are part of the region).

Parameters:

  [out] | left | receives the left extent of the region
  [out] | right | receives the right extent of the region
  [out] | bottom | receives the bottom extent of the region
  [out] | top | receives the top extent of the region

Returns:
  - MS::kSuccess Operation was successful, returned values are valid.
  - MS::kFailure Operation failed because no Render View existed.

Examples:
  renderViewRenderRegionCmd.cpp.

MStatus startRender | ( | unsigned int | width,
|  | unsigned int | height,
|  | bool | doNotClearBackground = `false`,
|  | bool | immediateFeedback = `false`
| ) |  | `[static]`

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Informs the Render View that a full image render is about to begin.

The entire Render View buffer will be cleared in anticipation of receiving an entire image.

Parameters:

  [in] | width | width of the image to be sent to the Render View (must be greater than zero).
  [in] | height | height of the image to be sent to the Render View (must be greater than zero).
  [in] | doNotClearBackground | When true, the Render View is not cleared before starting to draw. Default (false) is to clear the Render View.
  [in] | immediateFeedback | When true, each call to refresh() will immediately redraw the Render View. Default (false) is to wait at least two seconds between redraws.

Returns:
  - MS::kSuccess Operation was successful.
  - MS::kInvalidParameter Operation failed because the specified width or height was invalid.
  - MS::kFailure Operation failed because no Render View existed.

Examples:
  renderViewInteractiveRenderCmd.cpp, and renderViewRenderCmd.cpp.

MStatus startRegionRender | ( | unsigned int | imageWidth,
|  | unsigned int | imageHeight,
|  | unsigned int | regionLeft,
|  | unsigned int | regionRight,
|  | unsigned int | regionBottom,
|  | unsigned int | regionTop,
|  | bool | doNotClearBackground = `false`,
|  | bool | immediateFeedback = `false`
| ) |  | `[static]`

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Informs the Render View that a region render is about to begin.

The specified region will be cleared in anticipation of receiving new image data for it. The specified region must lie within the image region (0,0)->(imageWidth-1,imageHeight-1). The region 'left' coordinate must be less than the region 'right' coordinate, and the region 'bottom' coordinate must be less than the region 'top' coordinate.

Parameters:

  [in] | imageWidth | width of the image in which the region is embedded. (must be greater than zero).
  [in] | imageHeight | height of the image in which the region is embedded (must be greater than zero).
  [in] | regionLeft | left extent of the region.
  [in] | regionRight | right extent of the region. The column x=regionRight is considered part of the region.
  [in] | regionBottom | bottom extent of the region.
  [in] | regionTop | top extent of the region. The row y=regionTop is considered part of the region.
  [in] | doNotClearBackground | When true, the Render View is not cleared before starting to draw. Default (false) is to clear the Render View.
  [in] | immediateFeedback | When true, each call to refresh() will immediately redraw the Render View. Default (false) is to wait at least two seconds between redraws.

Returns:
  - MS::kSuccess Operation was successful.
  - MS::kInvalidParameter Operation failed because either the specified image width/height or the specified image region was invalid.
  - MS::kFailure Operation failed because no Render View existed.

Examples:
  renderViewRenderRegionCmd.cpp.

MStatus updatePixels | ( | unsigned int | left,
|  | unsigned int | right,
|  | unsigned int | bottom,
|  | unsigned int | top,
|  | RV_PIXEL * | pPixels,
|  | bool | isHdr = `false`,
|  | const unsigned int | numberOfAOVs = `0`,
|  | const RV_AOV *const | pAOVs = `NULL`
| ) |  | `[static]`

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Sends a block of pixels to the Render View.

Pixel colors are represented as 4-channel floating point values. For low dynamic range images, color values are in standard RGB (sRGB) colorspace, and in the range (0,255.0). For high dynamic range (HDR) images, the range is unbounded, and values are in linear CIE XYZ color space, with the X, Y, and Z values stored respectively in the R, G and B fields of the RV_PIXEL structure. Alpha values for HDR images are expected to be in the range (0,1). Out of range alpha values are not clamped, and may behave unexpectedly.

Parameters:

  [in] | left | left extent of the update region.
  [in] | right | right extent of the update region. The column x=right is considered part of the region.
  [in] | bottom | bottom extent of the update region.
  [in] | top | top extent of the update region. The row y=regionTop is considered part of the region.
  [in] | pPixels | buffer containing the pixel data for the image. The buffer should contain (right-left+1)*(top-bottom+1) pixels.
  [in] | isHdr | indicates whether the image has high dynamic range
  [in] | numberOfAOVs | indicates the number of arbitrary output variable (AOV) buffers (not yet implemented).
  [in] | pAOVs | array of RV_AOV objects. The height and width of each AOV must match pPixels (not yet implemented).

Returns:
  - MS::kSuccess Operation was successful.
  - MS::kInvalidParameter Operation failed, either because the specified update region was invalid, or because the specified pixel buffer was NULL.
  - MS::kFailure Operation failed because no Render View existed.

Examples:
  renderViewInteractiveRenderCmd.cpp, renderViewRenderCmd.cpp, and renderViewRenderRegionCmd.cpp.

MStatus refresh | ( | unsigned int | left,
|  | unsigned int | right,
|  | unsigned int | bottom,
|  | unsigned int | top
| ) |  | `[static]`

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Requests that the Render View refresh the display of a particular region of the displayed image.

Parameters:

  [in] | left | left extent of the update region.
  [in] | right | right extent of the update region. The column x=right is considered part of the region.
  [in] | bottom | bottom extent of the update region.
  [in] | top | top extent of the update region. The row y=regionTop is considered part of the region.

Returns:
  - MS::kSuccess Operation was successful.
  - MS::kInvalidParameter Operation failed, because the specified refresh region was invalid.
  - MS::kFailure Operation failed because no Render View existed.

Examples:
  renderViewInteractiveRenderCmd.cpp, renderViewRenderCmd.cpp, and renderViewRenderRegionCmd.cpp.

MStatus endRender | ( |  | ) | `[static]`

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Informs the Render View that the current render has completed.

The Render View is refreshed and no further updates are accepted.

Returns:
  - MS::kSuccess Operation was successful.
  - MS::kFailure Operation failed because no Render View existed.

Examples:
  renderViewInteractiveRenderCmd.cpp, renderViewRenderCmd.cpp, and renderViewRenderRegionCmd.cpp.

static const char* className | ( |  | ) | `[inline, static]`

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Returns the name of this class.

Returns:
  The name of this class.

MRenderView MRenderView MRenderView MRenderView MRenderView MRenderView MRenderView MRenderView MRenderView MRenderView
MRenderView MRenderView MRenderView MRenderView MRenderView MRenderView MRenderView MRenderView MRenderView MRenderView