Detailed Description
- See also:
- Class ShadeContext
- Description:
- This interface provides access to some shade context
information for the working model. It is used when performing a
projection mapped Render To Texture, to support shading operations
on the reference models which additionally require information
about the working model.
This interface is provided by the renderer to Texture Bake elements, when performing a Render To Texture (RTT) in projection mode. In this mode, pixels are shaded as follows. First, the renderer locates a point on the working model. A ray is cast to locate a corresponding point on one of the reference models. Material shading proceeds on the reference model instead of the working model. The material is responsible for invoking each texture bake element and render element, as part of its shading operation. However, the texture bake elements might need information about the working model, and the shade context only contains information for the reference model. The renderer solves this problem by attaching an IProjection_WorkingModelInfo interface to the ShadeContext that it passes to the material.
When a bake projection is done, all the information in the shade context is overriden to represent the intersection point on the projected object. If a bake render element still needs access to shade context information from the original object (the working model), then this interface may be used.
This interface provides a render instance of the working model and information about the working model point being shaded. It should be queried from the shade context through ShadeContext::GetInterface(). A NULL pointer will be returned if no projection was done.
- Examples:
- For an example of usage, please refer to the Normal Map and Height Map texture bake elements, in the SDK samples maxsdk\samples\render\renderelements\stdBakeElem.cpp.
#include <IProjection_WorkingModelInfo.h>
Inheritance diagram for
IProjection_WorkingModelInfo:
Public Member Functions |
|
| virtual RenderInstance * | GetRenderInstance ()=0 |
| Returns the render instance of the working
model. |
|
| virtual int | GetFaceNumber ()=0 |
| Returns the face number of that hit face.
|
|
| virtual const Point3 & | GetOrigNormal ()=0 |
| Returns the original interpolated normal.
|
|
| virtual void | GetBarycentricCoords (Point3 &bary)=0 |
| Returns the barycentric coordinates of the
hit point. |
|
| virtual void | GetBarycentricCoords (float &b0, float &b1, float &b2)=0 |
| virtual BOOL | GetBackFace ()=0 |
| Returns whether the backface was hit.
|
|
| virtual const Point3 & | GetPoint ()=0 |
| Returns the point that was hit, in camera
space. |
|
| virtual const Point3 & | GetViewDir ()=0 |
| Get the view direction, in camera space
(equivalent to SContext::V()) |
|
| virtual const Point3 & | GetOriginalViewDir ()=0 |
| Get the original view direction, in camera
space (equivalent to SContext::OrigView()) |
|
| virtual int | GetMaterialNumber ()=0 |
| Get the material number of the hit face.
|
|
| virtual void | BumpBasisVectors (Point3 dP[2], int axis, int channel)=0 |
| Get the bump basis vectors of the hit face
(equivalent to SContext::BumpBasisVectors()) |
|
| virtual void | TangentBasisVectors (Point3 dP[2], int mapChannel)=0 |
| Get the map basis vectors (aks bump basis
vectors) interpolated at the current position. |
|
| virtual Interface_ID | GetID () |
Static Public Member Functions |
|
| static IProjection_WorkingModelInfo * |
GetInterface (ShadeContext &shadeContext) |
| Query this interface on a shade context.
|
|
Member Function Documentation
| IProjection_WorkingModelInfo * GetInterface | ( | ShadeContext & | shadeContext | ) | [inline, static] |
Query this interface on a shade context.
{
return static_cast<IProjection_WorkingModelInfo*>(shadeContext.GetInterface(IPROJECTION_WORKINGMODELINFO_INTERFACE_ID));
}
| virtual RenderInstance* GetRenderInstance | ( | ) | [pure virtual] |
Returns the render instance of the working model.
| virtual int GetFaceNumber | ( | ) | [pure virtual] |
Returns the face number of that hit face.
| virtual const Point3& GetOrigNormal | ( | ) | [pure virtual] |
Returns the original interpolated normal.
| virtual void GetBarycentricCoords | ( | Point3 & | bary | ) | [pure virtual] |
Returns the barycentric coordinates of the hit point.
| virtual void GetBarycentricCoords | ( | float & | b0, |
| float & | b1, | ||
| float & | b2 | ||
| ) | [pure virtual] |
| virtual BOOL GetBackFace | ( | ) | [pure virtual] |
Returns whether the backface was hit.
| virtual const Point3& GetPoint | ( | ) | [pure virtual] |
Returns the point that was hit, in camera space.
| virtual const Point3& GetViewDir | ( | ) | [pure virtual] |
Get the view direction, in camera space (equivalent to SContext::V())
| virtual const Point3& GetOriginalViewDir | ( | ) | [pure virtual] |
Get the original view direction, in camera space (equivalent to SContext::OrigView())
| virtual int GetMaterialNumber | ( | ) | [pure virtual] |
Get the material number of the hit face.
| virtual void BumpBasisVectors | ( | Point3 | dP[2], |
| int | axis, | ||
| int | channel | ||
| ) | [pure virtual] |
Get the bump basis vectors of the hit face (equivalent to SContext::BumpBasisVectors())
| virtual void TangentBasisVectors | ( | Point3 | dP[2], |
| int | mapChannel | ||
| ) | [pure virtual] |
Get the map basis vectors (aks bump basis vectors) interpolated at the current position.
| Interface_ID GetID | ( | ) | [inline, virtual] |
- Remarks:
- This method returns the unique interface ID.
Reimplemented from BaseInterface.
{
return IPROJECTION_WORKINGMODELINFO_INTERFACE_ID;
}
