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The SoShadowGroup node is a group node used for shadow rendering. More...
#include <FXViz/nodes/SoSeparator.h>
Public Types | |
enum | VisibilityFlag { ABSOLUTE_RADIUS , LONGEST_BBOX_EDGE_FACTOR , PROJECTED_BBOX_DEPTH_FACTOR } |
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enum | CacheEnabled { OFF , ON , AUTO } |
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enum | NodeType { INVENTOR = 0x0000 , VRML1 = 0x0001 , VRML2 = 0x0002 , INVENTOR_1 = 0x0004 , INVENTOR_2_0 = 0x0008 , INVENTOR_2_1 = 0x0010 , INVENTOR_2_5 = 0x0020 , INVENTOR_2_6 = 0x0040 , COIN_1_0 = 0x0080 , COIN_2_0 = 0x0100 , EXTENSION = 0x0200 , COIN_2_2 = 0x0400 , COIN_2_3 = 0x0800 , COIN_2_4 = 0x1000 , INVENTOR_5_0 = 0x2000 , COIN_2_5 = 0x4000 } |
Static Protected Member Functions | |
static const SoFieldData ** | getFieldDataPtr (void) |
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static const SoFieldData ** | getFieldDataPtr (void) |
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static const SoFieldData ** | getFieldDataPtr (void) |
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static const SoFieldData ** | getFieldDataPtr (void) |
static void | setNextActionMethodIndex (int index) |
static int | getNextActionMethodIndex (void) |
static void | incNextActionMethodIndex (void) |
static void | setCompatibilityTypes (const SoType &nodetype, const uint32_t bitmask) |
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static uint32_t | getCurrentWriteCounter (void) |
static void | staticDataLock (void) |
static void | staticDataUnlock (void) |
Additional Inherited Members | |
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enum | BaseFlags { IS_ENGINE = 0x01 , IS_GROUP = 0x02 } |
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SoChildList * | children |
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uint32_t | uniqueId |
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SbBool | isBuiltIn |
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static uint32_t | nextUniqueId = 0 |
static int | nextActionMethodIndex = 0 |
The SoShadowGroup node is a group node used for shadow rendering.
Children of this node can recieve shadows, and cast shadows on other children. Use the SoShadowStyle node to control shadow casters and shadow receivers.
Please note that all shadow casters will be rendered twice. Once to create the shadow map, and once for normal rendering. If you're having performance issues, you should consider reducing the number of shadow casters.
The algorithm used to render the shadows is Variance Shadow Maps (http://www.punkuser.net/vsm/). As an extra bonus, all geometry rendered with shadows can also be rendered with per fragment phong lighting.
This node will search its subgraph and calculate shadows for all SoSpotLight nodes. The node will use one texture unit for each spot light, so for this node to work 100%, you need to have num-spotlights free texture units while rendering the subgraph.
Currently, we only support scenes with maximum two texture units active while doing shadow rendering (unit 0 and unit 1). This is due to the fact that we emulate the OpenGL shading model in a shader program, and we're still working on creating a solution that updates the shader program during the scene graph traversal. Right now a shader program is created when entering the SoShadowGroup node, and this is used for the entire subgraph.
FILE FORMAT/DEFAULTS:
Example scene graph:
SoShadowGroup::SoShadowGroup | ( | void | ) |
Default constructor.
References epsilon, intensity, isActive, precision, quality, shadowCachingEnabled, smoothBorder, threshold, visibilityFlag, visibilityNearRadius, and visibilityRadius.
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protectedvirtual |
Destructor.
Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and "downward" casting.
Usage example:
For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the pre-defined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.
For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.
Reimplemented from SoSeparator.
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protectedvirtual |
Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL
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Reimplemented from SoSeparator.
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virtual |
SGI Open Inventor v2.1 obsoleted support for SoGLRenderAction::addMethod(). Instead, GLRender() might be called directly, and to optimize traversal, the SoSeparator node calls GLRenderBelowPath whenever the path code is BELOW_PATH or NO_PATH (path code is guaranteed not to change). To be compatible with SGI's Inventor (and thereby also TGS') we have chosen to follow their implementation in this respect.
SoSeparator::GLRenderBelowPath() do not traverse its children using SoChildList::traverse(), but calls GLRenderBelowPath() directly for all its children.
Reimplemented from SoSeparator.
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virtual |
Implements the SoAction::IN_PATH traversal method for the rendering action.
Reimplemented from SoSeparator.
Notifies all auditors for this instance when changes are made.
Reimplemented from SoSeparator.
References SoBase::isOfType(), and SoSeparator::notify().
SoSFBool SoShadowGroup::isActive |
Use this field to turn shadow rendering for the subgraph on/off. Default value is TRUE.
Referenced by SoShadowGroup().
SoSFFloat SoShadowGroup::intensity |
Not used yet. Provided for TGS Inventor compatibility.
Referenced by SoShadowGroup().
SoSFFloat SoShadowGroup::precision |
Use to calculate the size of the shadow map. A precision of 1.0 means the maximum shadow buffer size will be used (typically 2048x2048 on current graphics cards). Default value is 0.5.
Referenced by SoShadowGroup().
SoSFFloat SoShadowGroup::quality |
Can be used to tune the shader program complexity. A higher value will mean that more calculations are done per-fragment instead of per-vertex. Default value is 0.5.
Referenced by SoShadowGroup().
SoSFInt32 SoShadowGroup::smoothBorder |
SoShadowGroup::VisibilityFlag SoShadowGroup::ABSOLUTE_RADIUS
The absolute values of visibilityNearRadius and visibilityRadius will be used.
SoShadowGroup::VisibilityFlag SoShadowGroup::LONGEST_BBOX_EDGE_FACTOR
The longest bbox edge will be used to determine near and far clipping planes.
SoShadowGroup::VisibilityFlag SoShadowGroup::PROJECTED_BBOX_DEPTH_FACTOR
The bbox depth (projected to face the camera) will be used to calculate the clipping planes.
We have some problems with this feature so it's not supported at the moment.
Used to add shadow border smoothing. This is currently done as a post processing step on the shadow map. The algorithm used is Gauss Smoothing, but in the future we'll probably change this, and use a summed area sampling merhod instead. The value should be a number between 0 (no smoothing), and 1 (max smoothing).
If you want to enable smoothing, choosing a low value (~0.1) works best in the current implementation.
Default value is 0.0.
Referenced by SoShadowGroup().
SoSFBool SoShadowGroup::shadowCachingEnabled |
Not used yet. Provided for TGS Inventor compatibility.
Referenced by SoShadowGroup().
SoSFFloat SoShadowGroup::visibilityNearRadius |
Can be used to manually set the near clipping plane of the shadow maps. If a negative value is provided, the group will calculate a near plane based on the bounding box of the children. Default value is -1.0.
Referenced by SoShadowGroup().
SoSFFloat SoShadowGroup::visibilityRadius |
Can be used to manually set the far clipping plane of the shadow maps. If a negative value is provided, the group will calculate a near plane based on the bounding box of the children. Default value is -1.0.
Referenced by SoShadowGroup().
SoSFEnum SoShadowGroup::visibilityFlag |
Determines how visibilityRadius and visibilitNearRadius is used to calculate near and far clipping planes for the shadow volume.
Referenced by SoShadowGroup().
SoSFFloat SoShadowGroup::epsilon |
Epsilon is used to offset the shadow map depth from the model depth. Should be set to as low a number as possible without causing flickering in the shadows or on non-shadowed objects. Default value is 0.00001.
Referenced by SoShadowGroup().
SoSFFloat SoShadowGroup::threshold |
Can be used to avoid light bleeding in merged shadows cast from different objects.
A threshold to completely eliminate all light bleeding can be computed from the ratio of overlapping occluder distances from the light's perspective. See http://forum.beyond3d.com/showthread.php?t=38165 for a discussion about this problem.
Referenced by SoShadowGroup().
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