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lib/maxsdk70/include/IProjection_WorkingModelInfo.h

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+/*==============================================================================
+
+  file:     IProjection_WorkingModelInfo.h
+
+  author:   Daniel Levesque
+
+  created:  19 May 2004
+
+  description:
+
+      Definition of an interface that gives access to basic shade context information
+	  on the working model of a bake projection.
+
+	  This interface is to be used along with the bake projection feature, which
+	  allows using high-res objects when baking maps for low-res objects.
+
+  modified:	
+
+
+<EFBFBD> 2004 Autodesk
+==============================================================================*/
+
+#ifndef _IPROJECTION_WORKINGMODELINFO_H_
+#define _IPROJECTION_WORKINGMODELINFO_H_
+
+#include <BaseInterface.h>
+
+class RenderInstance;
+class Point3;
+
+//==============================================================================
+// class IProjection_WorkingModelInfo
+//
+// This interface provides access to some shade context information for the
+// working model.
+//
+// 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 should be queried from the shade context through GetInterface().
+// A NULL pointer will be returned if no projection was done.
+//==============================================================================
+class IProjection_WorkingModelInfo : public BaseInterface {
+
+public:
+
+	// Query this interface on a shade context
+	static IProjection_WorkingModelInfo* GetInterface(ShadeContext& shadeContext);
+
+	// Returns the render instance of the working model
+	virtual RenderInstance* GetRenderInstance() = 0;
+	// Returns the face number of that hit face
+	virtual int GetFaceNumber() = 0;
+	// Returns the original interpolated normal
+	virtual const Point3& GetOrigNormal() = 0;
+	// Returns the barycentric coordinates of the hit point
+    virtual void GetBarycentricCoords(Point3& bary) = 0;    
+	virtual void GetBarycentricCoords(float& b0, float& b1, float& b2) = 0;
+	// Returns whether the backface was hit
+	virtual BOOL GetBackFace() = 0;
+	// Returns the point that was hit, in camera space
+	virtual const Point3& GetPoint() = 0;
+	// Get the view direction, in camera space (equivalent to SContext::V())
+	virtual const Point3& GetViewDir() = 0;
+	// Get the original view direction, in camera space (equivalent to SContext::OrigView())
+	virtual const Point3& GetOriginalViewDir() = 0;
+	// Get the material number of the hit face
+	virtual int GetMaterialNumber() = 0;
+	// Get the bump basis vectors of the hit face (equivalent to SContext::BumpBasisVectors())
+	virtual void BumpBasisVectors(Point3 dP[2], int axis, int channel) = 0;
+	// Get the map basis vectors (aks bump basis vectors) interpolated at the current position
+	virtual void TangentBasisVectors(Point3 dP[2], int mapChannel) = 0;
+
+	// -- from BaseInterface
+	virtual Interface_ID GetID();
+};
+
+#define IPROJECTION_WORKINGMODELINFO_INTERFACE_ID Interface_ID(0x79907259, 0xbf05948)
+
+inline IProjection_WorkingModelInfo* IProjection_WorkingModelInfo::GetInterface(ShadeContext& shadeContext) {
+
+	return static_cast<IProjection_WorkingModelInfo*>(shadeContext.GetInterface(IPROJECTION_WORKINGMODELINFO_INTERFACE_ID));
+}
+
+inline Interface_ID IProjection_WorkingModelInfo::GetID() {
+
+	return IPROJECTION_WORKINGMODELINFO_INTERFACE_ID;
+}
+
+#endif