RemoteRendering

MLModule

genre	Remote
author	MeVis Medical Solutions AG
package	MeVisLab/Standard
dll	MLRemoteRendering
definition	MLRemoteRendering.def
see also	RemoteRenderingClient

Purpose

The module RemoteRendering is intended for use in remote modules (it will also work locally, though) and allows interaction with and display of Open Inventor scenes in remote modules. It achieves this by sending updated images to a client and receiving input events from that client.

Usage

Attach your Open Inventor scene to the input of this module.

Attaching a RemoteRenderingClient to the output will render the scene to an internal buffer, which will be displayed by the panel of the RemoteRenderingClient. (You can also use a MLAB.GUI.RemoteRenderingControl control directly.)

Typically, this is done by utilizing the RemoteRendering module within a macro module that is converted into a remote module.

Details

This module renders the scene more or less the same way as the OffscreenRender module.

Tips

You can use a SoCameraInteraction module in your scene if you want basic camera interaction (and lighting) for a 3D scene.

Windows

Default Panel

Input Fields

sceneGraph

name: sceneGraph, type: SoNode

Connect your Open Inventor scene to this input.

Output Fields

output

name: output, type: RemoteRendering(MLBase)

Connect a RemoteRenderingClient module to this output. Or apply a RemoteRendering control directly on this field.

For accessing this object via scripting, see the Scripting Reference: MLRemoteRenderingWrapper.

Parameter Fields

Field Index

<Double-click intercepted>: Trigger	imageCacheId: String	miSelectedPointingActionProvider: String
Background Color: Color	imageRendered: Trigger	Multi Sampling: Integer
clearImageCacheOnClient: Trigger	inputDevicesList: String	Store Transparency: Bool
doubleClickInterceptedPosition: Vector2	Interactive Image Type: Enum	Supported: Bool
Enable: Bool	Interactive Jpg Quality: Integer	Suppress render updates: Bool
Enable Multi Sampling: Bool	Intercept double-clicks: Bool	Transparency Type: Enum
High Quality Image Type: Enum	miSelectedPointingAction: String	Use stencil buffer: Bool
High Quality Jpg Quality: Integer	miSelectedPointingActionActive: Bool

Visible Fields

Enable Multi Sampling

name: enableMultiSampling, type: Bool, default: FALSE

If checked, multi-sample anti-aliasing (MSAA) is enabled. This only works if framebuffer objects are supported.

Multi Sampling

name: multiSampling, type: Integer, default: 16

Sets the number of multi-sampling samples that are used. If the hardware supports fewer samples, the module will use the maximum supported number of samples.

Store Transparency

name: storeTransparency, type: Bool, default: FALSE

If checked, the alpha channel of the framebuffer is enabled and the resulting alpha is sent with the rendered image. This forces the usage of PNG, since JPG does not support transparency.

Intercept double-clicks

name: interceptDoubleClicks, type: Bool, default: FALSE

If checked, the RemoteRendering module will intercept and remove double clicks (including the first click of a double click). This is done by delaying mouse clicks until the double click is received or the double click threshold (time or distance) is exceeded.

Be aware that using this feature can disrupt the usual ordering of input events and other messages received from the remote connection.

<Double-click intercepted>

name: doubleClickIntercepted, type: Trigger

This is triggered when a double click was intercepted by the module.

Enable

name: overrideStreamingQuality, type: Bool, default: FALSE

If checked, the module allows for overriding the image type and quality for image streaming.

NOTE: Typically the client can select the desired type and quality by sending the streaming settings, e.g., from JavaScript or the HTTP URL. If this option is enabled, the quality is set by the server/this module and cannot be set from the client anymore.

Interactive Image Type

name: interactiveImageType, type: Enum, default: JPG

Defines the type of the interactive image.

Values:

Title	Name
​Jpg	​JPG
​Png	​PNG
​Bmp	​BMP
​Webp Lossy	​WEBP_LOSSY
​Webp Lossless	​WEBP_LOSSLESS
​Jpg Alpha	​JPG_ALPHA

High Quality Image Type

name: highQualityImageType, type: Enum, default: PNG

Defines the high quality image type.

Values:

Title	Name
​Jpg	​JPG
​Png	​PNG
​Bmp	​BMP
​Webp Lossy	​WEBP_LOSSY
​Webp Lossless	​WEBP_LOSSLESS
​Jpg Alpha	​JPG_ALPHA

Interactive Jpg Quality

name: interactiveJpgQuality, type: Integer, default: 70, minimum: 0, maximum: 100

Sets the interactive JPG Quality (0-100).

High Quality Jpg Quality

name: highQualityJpgQuality, type: Integer, default: 100, minimum: 0, maximum: 100

Sets the high quality JPG quality (0-100)

Supported

name: supported, type: Bool, persistent: no

Shows whether offscreen rendering is available with your current graphics card and driver.

Use stencil buffer

name: stencilBuffer, type: Bool, default: TRUE

If checked, the stencil buffer support is activated.

Suppress render updates

name: suppressUpdates, type: Bool, default: FALSE

While checked, no scene update notifications are sent to any client. Only when disabled will a notification be sent (if necessary).

This does not provide 100% protection against unwanted render updates. If a client requests a render update, for example, because the scene was changed immediately before the suppression was activated, the scene is still rendered, and the image is sent to the client.

Transparency Type

name: transparencyType, type: Enum, default: BLEND

Defines the transparency type as it is also available in the SoRenderArea and SoExaminerViewer modules.

Values:

Title	Name
​Screen Door	​SCREEN_DOOR
​Add	​ADD
​Delayed Add	​DELAYED_ADD
​Sorted Object Add	​SORTED_OBJECT_ADD
​Blend	​BLEND
​Delayed Blend	​DELAYED_BLEND
​Sorted Object Blend	​SORTED_OBJECT_BLEND

Background Color

name: bgColor, type: Color, default: 0 0 0

Sets the default background color of the rendering.

Default is, of course, black.

Hidden Fields

imageRendered

name: imageRendered, type: Trigger

doubleClickInterceptedPosition

name: doubleClickInterceptedPosition, type: Vector2, persistent: no

imageCacheId

name: imageCacheId, type: String

clearImageCacheOnClient

name: clearImageCacheOnClient, type: Trigger

inputDevicesList

name: inputDevicesList, type: String

miSelectedPointingAction

name: miSelectedPointingAction, type: String, persistent: no

Shows the name of the pointing action currently selected by the Managed Interaction framework.

If this pointing action is not currently active (see miSelectedPointingActionActive), it is at least used for highlighting and for selecting the cursor shape.

miSelectedPointingActionProvider

name: miSelectedPointingActionProvider, type: String, persistent: no

Shows the name of the interaction provider node that provides the currently selected pointing action (see miSelectedPointingAction).

miSelectedPointingActionActive

name: miSelectedPointingActionActive, type: Bool, persistent: no

Shows whether the currently selected pointing action (see miSelectedPointingAction) is used for clicking or dragging.