C++ ParamSet::AddNormal方法代码示例

void LuxRenderer::createAreaLightMesh(mtlu_MayaObject *obj)
{
	MString meshName("");
	MFnDependencyNode depFn(obj->mobject);
	MObject otherSideObj = getOtherSideNode(MString("mtlu_areaLight_geo"), obj->mobject);
	if( otherSideObj != MObject::kNullObj)
	{


	}else{
		int indices[6] = {0,1,2,2,3,0};
		float floatPointArray[12] = {-1, -1, 0,
									 -1,  1, 0,
									  1,  1, 0,
									  1, -1, 0};

		float floatNormalArray[12] = {0,0,-1,
									  0,0,-1,
									  0,0,-1,
									  0,0,-1};

		ParamSet triParams = CreateParamSet();
		triParams->AddInt("indices", indices, 6);
		triParams->AddPoint("P", floatPointArray, 4);
		triParams->AddNormal("N", floatNormalArray, 4);
		
		lux->transformBegin();
		float fm[16];
		MMatrix tm = obj->transformMatrices[0];
		setZUp(tm, fm);
		this->lux->transform(fm);
		this->lux->shape("trianglemesh", boost::get_pointer(triParams));
		lux->transformEnd();
	}
}

//.........这里部分代码省略.........

			floatNormalArray[vtxCount * 3] = normals[normalId2].x;
			floatNormalArray[vtxCount * 3 + 1] = normals[normalId2].y;
			floatNormalArray[vtxCount * 3 + 2] = normals[normalId2].z;

			floatUvArray[vtxCount * 2] = uArray[uvId2];
			floatUvArray[vtxCount * 2 + 1] = vArray[uvId2];

			vtxCount++;
			
			//logger.debug(MString("Vertex count: ") + vtxCount + " maxId " + ((vtxCount - 1) * 3 + 2) + " ptArrayLen " + (numTriangles * 3 * 3));

			triangelVtxIdList[triCount * 3] = triCount * 3;
			triangelVtxIdList[triCount * 3 + 1] = triCount * 3 + 1;
			triangelVtxIdList[triCount * 3 + 2] = triCount * 3 + 2;

			triCount++;
		}		
	}

//generatetangents 	bool 	Generate tangent space using miktspace, useful if mesh has a normal map that was also baked using miktspace (such as blender or xnormal) 	false
//subdivscheme 	string 	Subdivision algorithm, options are "loop" and "microdisplacement" 	"loop"
//displacementmap 	string 	Name of the texture used for the displacement. Subdivscheme parameter must always be provided, as load-time displacement is handled by the loop-subdivision code. 	none - optional. (loop subdiv can be used without displacement, microdisplacement will not affect the mesh without a displacement map specified)
//dmscale 	float 	Scale of the displacement (for an LDR map, this is the maximum height of the displacement in meter) 	0.1
//dmoffset 	float 	Offset of the displacement. 	0
//dmnormalsmooth 	bool 	Smoothing of the normals of the subdivided faces. Only valid for loop subdivision. 	true
//dmnormalsplit 	bool 	Force the mesh to split along breaks in the normal. If a mesh has no normals (flat-shaded) it will rip open on all edges. Only valid for loop subdivision. 	false
//dmsharpboundary 	bool 	Try to preserve mesh boundaries during subdivision. Only valid for loop subdivision. 	false
//nsubdivlevels 	integer 	Number of subdivision levels. This is only recursive for loop subdivision, microdisplacement will need much larger values (such as 50). 	0

	bool generatetangents = false;
	getBool(MString("mtlu_mesh_generatetangents"), meshFn, generatetangents);
	int subdivscheme = 0;
	const char *subdAlgos[] = {"loop", "microdisplacement"};
	getInt(MString("mtlu_mesh_subAlgo"), meshFn, subdivscheme);
	const char *subdalgo =  subdAlgos[subdivscheme];
	float dmscale;
	getFloat(MString("mtlu_mesh_dmscale"), meshFn, dmscale);
	float dmoffset;
	getFloat(MString("mtlu_mesh_dmoffset"), meshFn, dmoffset);
	MString displacementmap;
	getString(MString("mtlu_mesh_displacementMap"), meshFn, displacementmap);
	const char *displacemap = displacementmap.asChar();
	bool dmnormalsmooth = true;
	getBool(MString("mtlu_mesh_dmnormalsmooth"), meshFn, dmnormalsmooth);
	bool dmnormalsplit = false;
	getBool(MString("mtlu_mesh_dmnormalsplit"), meshFn, dmnormalsplit);
	bool dmsharpboundary = false;
	getBool(MString("mtlu_mesh_dmsharpboundary"), meshFn, dmsharpboundary);
	int nsubdivlevels = 0;
	getInt(MString("mtlu_mesh_subdivlevel"), meshFn, nsubdivlevels);

	// a displacment map needs its own texture defintion
	MString displacementTextureName = "";
	if(displacementmap.length() > 0)
	{
		ParamSet dmParams = CreateParamSet();
		dmParams->AddString("filename", &displacemap);
		displacementTextureName = meshFn.name() + "_displacementMap";
		this->lux->texture(displacementTextureName.asChar(), "float", "imagemap", boost::get_pointer(dmParams));
	}

	ParamSet triParams = CreateParamSet();
	int numPointValues = numTriangles * 3;
	int numUvValues = numTriangles * 3 * 2;
	clock_t startTime = clock();
	logger.info(MString("Adding mesh values to params."));
	triParams->AddInt("indices", triangelVtxIdList, numTriangles * 3);
	triParams->AddPoint("P", floatPointArray, numPointValues);
	triParams->AddNormal("N", floatNormalArray, numPointValues);
	triParams->AddFloat("uv",  floatUvArray, numUvValues);
	if( nsubdivlevels > 0)
		triParams->AddInt("nsubdivlevels", &nsubdivlevels, 1);
	triParams->AddBool("generatetangents",  &generatetangents, 1);
	triParams->AddString("subdivscheme", &subdalgo , 1);
	if(displacementmap.length() > 0)
	{
		triParams->AddFloat("dmoffset",  &dmoffset, 1);
		triParams->AddFloat("dmscale",  &dmscale, 1);
		const char *dmft = displacementTextureName.asChar();
		triParams->AddString("displacementmap", &dmft);
	}
	triParams->AddBool("dmnormalsmooth",  &dmnormalsmooth, 1);
	triParams->AddBool("dmnormalsplit",  &dmnormalsplit, 1);
	triParams->AddBool("dmsharpboundary",  &dmsharpboundary, 1);


	clock_t pTime = clock();
	if(!noObjectDef)
		this->lux->objectBegin(meshFullName.asChar());
	this->lux->shape("trianglemesh", boost::get_pointer(triParams));
	if(!noObjectDef)
		this->lux->objectEnd();

	clock_t eTime = clock();
	logger.info(MString("Timing: Parameters: ") + ((pTime - startTime)/CLOCKS_PER_SEC) + " objTime " + ((eTime - pTime)/CLOCKS_PER_SEC) + " all " + ((eTime - startTime)/CLOCKS_PER_SEC));

	return;

}

//.........这里部分代码省略.........
                    f2 ? f2->children[f2->vnum(face->v[k])] : NULL;
                f2 = face->f[PREV(k)];
                face->children[k]->f[PREV(k)] =
                    f2 ? f2->children[f2->vnum(face->v[k])] : NULL;
            }
        }

        // Update face vertex pointers
        for (uint32_t j = 0; j < f.size(); ++j) {
            SDFace *face = f[j];
            for (int k = 0; k < 3; ++k) {
                // Update child vertex pointer to new even vertex
                face->children[k]->v[k] = face->v[k]->child;

                // Update child vertex pointer to new odd vertex
                SDVertex *vert = edgeVerts[SDEdge(face->v[k], face->v[NEXT(k)])];
                face->children[k]->v[NEXT(k)] = vert;
                face->children[NEXT(k)]->v[k] = vert;
                face->children[3]->v[k] = vert;
            }
        }

        // Prepare for next level of subdivision
        f = newFaces;
        v = newVertices;
    }
    // Push vertices to limit surface
    PbrtPoint *Plimit = new PbrtPoint[v.size()];
    for (uint32_t i = 0; i < v.size(); ++i) {
        if (v[i]->boundary)
            Plimit[i] =  weightBoundary(v[i], 1.f/5.f);
        else
            Plimit[i] =  weightOneRing(v[i], gamma(v[i]->valence()));
    }
    for (uint32_t i = 0; i < v.size(); ++i)
        v[i]->P = Plimit[i];

    // Compute vertex tangents on limit surface
    vector<Normal> Ns;
    Ns.reserve(v.size());
    vector<PbrtPoint> Pring(16, PbrtPoint());
    for (uint32_t i = 0; i < v.size(); ++i) {
        SDVertex *vert = v[i];
        Vector S(0,0,0), T(0,0,0);
        int valence = vert->valence();
        if (valence > (int)Pring.size())
            Pring.resize(valence);
        vert->oneRing(&Pring[0]);
        if (!vert->boundary) {
            // Compute tangents of interior face
            for (int k = 0; k < valence; ++k) {
                S += cosf(2.f*M_PI*k/valence) * Vector(Pring[k]);
                T += sinf(2.f*M_PI*k/valence) * Vector(Pring[k]);
            }
        } else {
            // Compute tangents of boundary face
            S = Pring[valence-1] - Pring[0];
            if (valence == 2)
                T = Vector(Pring[0] + Pring[1] - 2 * vert->P);
            else if (valence == 3)
                T = Pring[1] - vert->P;
            else if (valence == 4) // regular
                T = Vector(-1*Pring[0] + 2*Pring[1] + 2*Pring[2] +
                           -1*Pring[3] + -2*vert->P);
            else {
                float theta = M_PI / float(valence-1);
                T = Vector(sinf(theta) * (Pring[0] + Pring[valence-1]));
                for (int k = 1; k < valence-1; ++k) {
                    float wt = (2*cosf(theta) - 2) * sinf((k) * theta);
                    T += Vector(wt * Pring[k]);
                }
                T = -T;
            }
        }
        Ns.push_back(Normal(Cross(S, T)));
    }

    // Create _TriangleMesh_ from subdivision mesh
    uint32_t ntris = uint32_t(f.size());
    int *verts = new int[3*ntris];
    int *vp = verts;
    uint32_t totVerts = uint32_t(v.size());
    map<SDVertex *, int> usedVerts;
    for (uint32_t i = 0; i < totVerts; ++i)
        usedVerts[v[i]] = i;
    for (uint32_t i = 0; i < ntris; ++i) {
        for (int j = 0; j < 3; ++j) {
            *vp = usedVerts[f[i]->v[j]];
            ++vp;
        }
    }
    ParamSet paramSet;
    paramSet.AddInt("indices", verts, 3*ntris);
    paramSet.AddPoint("P", Plimit, totVerts);
    paramSet.AddNormal("N", &Ns[0], int(Ns.size()));
    refined.push_back(CreateTriangleMeshShape(ObjectToWorld,
            WorldToObject, ReverseOrientation, paramSet));
    delete[] verts;
    delete[] Plimit;
}

void NURBS::Refine(vector<Reference<Shape> > &refined) const {
	// Compute NURBS dicing rates
	int diceu = 30, dicev = 30;
	float *ueval = new float[diceu];
	float *veval = new float[dicev];
	Point *evalPs = new Point[diceu*dicev];
	Normal *evalNs = new Normal[diceu*dicev];
	int i;
	for (i = 0; i < diceu; ++i)
		ueval[i] = Lerp((float)i / (float)(diceu-1), umin, umax);
	for (i = 0; i < dicev; ++i)
		veval[i] = Lerp((float)i / (float)(dicev-1), vmin, vmax);
	// Evaluate NURBS over grid of points
	memset(evalPs, 0, diceu*dicev*sizeof(Point));
	memset(evalNs, 0, diceu*dicev*sizeof(Point));
	float *uvs = new float[2*diceu*dicev];
	// Turn NURBS into triangles
	Homogeneous3 *Pw = (Homogeneous3 *)P;
	if (!isHomogeneous) {
		Pw = (Homogeneous3 *)alloca(nu*nv*sizeof(Homogeneous3));
		for (int i = 0; i < nu*nv; ++i) {
			Pw[i].x = P[3*i];
			Pw[i].y = P[3*i+1];
			Pw[i].z = P[3*i+2];
			Pw[i].w = 1.;
		}
	}
	for (int v = 0; v < dicev; ++v) {
		for (int u = 0; u < diceu; ++u) {
			uvs[2*(v*diceu+u)]   = ueval[u];
			uvs[2*(v*diceu+u)+1] = veval[v];
	
			Vector dPdu, dPdv;
			Point pt = NURBSEvaluateSurface(uorder, uknot, nu, ueval[u],
				vorder, vknot, nv, veval[v], Pw, &dPdu, &dPdv);
			evalPs[v*diceu + u].x = pt.x;
			evalPs[v*diceu + u].y = pt.y;
			evalPs[v*diceu + u].z = pt.z;
			evalNs[v*diceu + u] = Normal(Normalize(Cross(dPdu, dPdv)));
		}
	}
	// Generate points-polygons mesh
	int nTris = 2*(diceu-1)*(dicev-1);
	int *vertices = new int[3 * nTris];
	int *vertp = vertices;
	// Compute the vertex offset numbers for the triangles
	for (int v = 0; v < dicev-1; ++v) {
		for (int u = 0; u < diceu-1; ++u) {
	#define VN(u,v) ((v)*diceu+(u))
			*vertp++ = VN(u,   v);
			*vertp++ = VN(u+1, v);
			*vertp++ = VN(u+1, v+1);
	
			*vertp++ = VN(u,   v);
			*vertp++ = VN(u+1, v+1);
			*vertp++ = VN(u,   v+1);
	#undef VN
		}
	}
	int nVerts = diceu*dicev;
	ParamSet paramSet;
	paramSet.AddInt("indices", vertices, 3*nTris);
	paramSet.AddPoint("P", evalPs, nVerts);
	paramSet.AddFloat("uv", uvs, 2 * nVerts);
	paramSet.AddNormal("N", evalNs, nVerts);
	refined.push_back(MakeShape("trianglemesh", ObjectToWorld,
			reverseOrientation, paramSet));
	// Cleanup from NURBS refinement
	delete[] uvs;
	delete[] ueval;
	delete[] veval;
	delete[] evalPs;
	delete[] evalNs;
	delete[] vertices;
}