Hierarchical Modeling - Essentials of Interactive Computer Graphics - page 292

class CArm : public UWB _ SceneNode {

Source file. Arm.h/cpp files
in the Model folder of the
D3D _ SceneNodeArm project.

A:

CArm( vec3 at, const char * name = "Arm");
.

}

CArm::CArm( vec3 at, const char * name) : UWB _ SceneNode(name)
B: m _ xform.SetPivot(at); // Pivot of M a is the Arm location

UWB _ PrimitiveRectangle * pRectangle = new UWB _ PrimitiveRectangle(); // memory for R a 0
// sets R a 0 geometry based on at position
.

C:

UWB _ PrimitiveList * pArmPrim = new UWB _ PrimitiveList(); // Memory for a PrimitiveList
pArmPrim->Append(pRectangle); // insert R a 0 into list

D:

SetPrimitive(pArmPrim); // m _ pPrimitive is a PrimitiveList
.

E:

UWB _ SceneNode * pPalm= new CPalm( vec3 (at.x+4,at.y,at.z); // Palm is at 4 unit in X from Arm
InsertChildNode(pPalm); // insert the allocated CPalm as a child

F:

Listing 11.7. The CArm class of Tutorial 11.4.

class CModel {

Source file. Model.h/cpp
files in the Model folder of the
D3D _ SceneNodeArm project.

// ... similar to Tutorial 11.3 ...

CArm m _ OneArm;

A:

// This is the arm

void DrawModel(); // Draw everything in the CModel

};

CModel::CModel() : ... // Constructor:

m _ OneArm( vec3 (0,0,0) )

B:

// initialize the arm to locate at (0,0,0)

{ ... }

void CModel::DrawModel()
C:

m _ OneArm.Draw(lod, m _ DrawHelper); // Draws the SceneNode hierarchy

.

Listing 11.8. The CModel class of Tutorial 11.4.

is created and inserted as a child of the CArm object. Listing 11.8 shows that with
the CArm class, the CModel class only needs to define (label A) and instantiate
the CArm object at a proper location (label B). As in the case of Tutorial 11.3, the
drawing of the arm is accomplished by calling the Draw() function (label C).