MRenderView Class Reference
[OpenMayaRender - API module for rendering]

#include <MRenderView.h>

List of all members.


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.

Static Public Member Functions

static bool  doesRenderEditorExist ()
static MStatus  setCurrentCamera (MDagPath &camera)
static MStatus  getRenderRegion (unsigned int &left, unsigned int &right, unsigned int &bottom, unsigned int &top)
static MStatus  startRender (unsigned int width, unsigned int height, bool doNotClearBackground=false, bool immediateFeedback=false)
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)
static MStatus  updatePixels (unsigned int left, unsigned int right, unsigned int bottom, unsigned int top, RV_PIXEL *pPixels, bool isHdr=false)
static MStatus  refresh (unsigned int left, unsigned int right, unsigned int bottom, unsigned int top)
static MStatus  endRender ()

Member Function Documentation

bool MRenderView::doesRenderEditorExist (  )  [static]

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:

MStatus MRenderView::setCurrentCamera ( MDagPath currentCamera  )  [static]

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

Returns:
Examples:

MStatus MRenderView::getRenderRegion ( unsigned int &  left,
unsigned int &  right,
unsigned int &  bottom,
unsigned int &  top  
) [static]

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:

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

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:
Examples:

MStatus MRenderView::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]

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:

MStatus MRenderView::updatePixels ( unsigned int  left,
unsigned int  right,
unsigned int  bottom,
unsigned int  top,
RV_PIXEL pPixels,
bool  isHdr = false  
) [static]

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
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:

MStatus MRenderView::refresh ( unsigned int  left,
unsigned int  right,
unsigned int  bottom,
unsigned int  top  
) [static]

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:
Examples:

MStatus MRenderView::endRender (  )  [static]

Informs the Render View that the current render has completed. The Render View is refreshed and no further updates are accepted.

Returns:
Examples:

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