1 files changed, 279 insertions, 0 deletions
diff --git a/NvBlast/sdk/extensions/authoring/source/NvBlastExtAuthoringCollisionBuilder.cpp b/NvBlast/sdk/extensions/authoring/source/NvBlastExtAuthoringCollisionBuilder.cpp
new file mode 100644
index 0000000..becdce9
--- /dev/null
+++ b/NvBlast/sdk/extensions/authoring/source/NvBlastExtAuthoringCollisionBuilder.cpp
@@ -0,0 +1,279 @@
+/*
+* Copyright (c) 2016-2017, NVIDIA CORPORATION.  All rights reserved.
+*
+* NVIDIA CORPORATION and its licensors retain all intellectual property
+* and proprietary rights in and to this software, related documentation
+* and any modifications thereto.  Any use, reproduction, disclosure or
+* distribution of this software and related documentation without an express
+* license agreement from NVIDIA CORPORATION is strictly prohibited.
+*/
+
+#include "NvBlastExtAuthoringCollisionBuilder.h"
+#include <PxConvexMesh.h>
+#include <PxVec3.h>
+#include <PxBounds3.h>
+#include "PxPhysics.h"
+#include "cooking/PxCooking.h"
+#include  <NvBlastExtApexSharedParts.h>
+#include <NvBlastExtAuthoringInternalCommon.h>
+
+#include <NvBlastExtAuthoringBooleanTool.h>
+#include <NvBlastExtAuthoringMesh.h>
+
+using namespace physx;
+
+namespace Nv
+{
+namespace Blast
+{
+
+void ConvexMeshBuilder::buildCollisionGeometry(const std::vector<PxVec3>& vData, CollisionHull& output)
+{
+	std::vector<physx::PxVec3> vertexData = vData;
+
+	PxConvexMeshDesc convexMeshDescr;
+	PxConvexMesh* resultConvexMesh;
+	PxBounds3 bounds;
+	// Scale chunk to unit cube size, to avoid numerical errors
+	bounds.setEmpty();
+	for (uint32_t i = 0; i < vertexData.size(); ++i)
+	{
+		bounds.include(vertexData[i]);
+	}
+	PxVec3 bbCenter = bounds.getCenter();
+	float scale = PxMax(PxAbs(bounds.getExtents(0)), PxMax(PxAbs(bounds.getExtents(1)), PxAbs(bounds.getExtents(2))));
+	for (uint32_t i = 0; i < vertexData.size(); ++i)
+	{
+		vertexData[i] = vertexData[i] - bbCenter;
+		vertexData[i] *= (1.0f / scale);
+	}
+	bounds.setEmpty();
+	for (uint32_t i = 0; i < vertexData.size(); ++i)
+	{
+		bounds.include(vertexData[i]);
+	}
+	convexMeshDescr.points.data = vertexData.data();
+	convexMeshDescr.points.stride = sizeof(PxVec3);
+	convexMeshDescr.points.count = (uint32_t)vertexData.size();
+	convexMeshDescr.flags = PxConvexFlag::eCOMPUTE_CONVEX;
+	resultConvexMesh = mCooking->createConvexMesh(convexMeshDescr, *mInsertionCallback);
+	if (!resultConvexMesh)
+	{
+		vertexData.clear();
+		vertexData.push_back(bounds.minimum);
+		vertexData.push_back(PxVec3(bounds.minimum.x, bounds.maximum.y, bounds.minimum.z));
+		vertexData.push_back(PxVec3(bounds.maximum.x, bounds.maximum.y, bounds.minimum.z));
+		vertexData.push_back(PxVec3(bounds.maximum.x, bounds.minimum.y, bounds.minimum.z));
+		vertexData.push_back(PxVec3(bounds.minimum.x, bounds.minimum.y, bounds.maximum.z));
+		vertexData.push_back(PxVec3(bounds.minimum.x, bounds.maximum.y, bounds.maximum.z));
+		vertexData.push_back(PxVec3(bounds.maximum.x, bounds.maximum.y, bounds.maximum.z));
+		vertexData.push_back(PxVec3(bounds.maximum.x, bounds.minimum.y, bounds.maximum.z));
+		convexMeshDescr.points.data = vertexData.data();
+		convexMeshDescr.points.count = (uint32_t)vertexData.size();
+		resultConvexMesh = mCooking->createConvexMesh(convexMeshDescr, *mInsertionCallback);
+	}
+	output.polygonData.resize(resultConvexMesh->getNbPolygons());
+	output.points.resize(resultConvexMesh->getNbVertices());
+	int32_t indicesCount = 0;
+	PxHullPolygon hPoly;
+	for (uint32_t i = 0; i < resultConvexMesh->getNbPolygons(); ++i)
+	{
+		CollisionHull::HullPolygon& pd = output.polygonData[i];
+		resultConvexMesh->getPolygonData(i, hPoly);
+		pd.mIndexBase = hPoly.mIndexBase;
+		pd.mNbVerts = hPoly.mNbVerts;
+		pd.mPlane[0] = hPoly.mPlane[0];
+		pd.mPlane[1] = hPoly.mPlane[1];
+		pd.mPlane[2] = hPoly.mPlane[2];
+		pd.mPlane[3] = hPoly.mPlane[3];
+
+		pd.mPlane[0] /= scale;
+		pd.mPlane[1] /= scale;
+		pd.mPlane[2] /= scale;
+		pd.mPlane[3] -= (pd.mPlane[0] * bbCenter.x + pd.mPlane[1] * bbCenter.y + pd.mPlane[2] * bbCenter.z);
+		float length = sqrt(pd.mPlane[0] * pd.mPlane[0] + pd.mPlane[1] * pd.mPlane[1] + pd.mPlane[2] * pd.mPlane[2]);
+		pd.mPlane[0] /= length;
+		pd.mPlane[1] /= length;
+		pd.mPlane[2] /= length;
+		pd.mPlane[3] /= length;
+		indicesCount = PxMax(indicesCount, pd.mIndexBase + pd.mNbVerts);
+	}
+	output.indices.resize(indicesCount);
+	for (uint32_t i = 0; i < resultConvexMesh->getNbVertices(); ++i)
+	{
+		PxVec3 p = resultConvexMesh->getVertices()[i] * scale + bbCenter;
+		output.points[i] = p;
+	}
+	for (int32_t i = 0; i < indicesCount; ++i)
+	{
+		output.indices[i] = resultConvexMesh->getIndexBuffer()[i];
+	}
+	resultConvexMesh->release();
+}
+
+void ConvexMeshBuilder::trimCollisionGeometry(std::vector<CollisionHull>& in, const std::vector<uint32_t>& chunkDepth)
+{
+	std::vector<std::vector<PxPlane> > chunkMidplanes(in.size());
+	std::vector<PxVec3> centers(in.size());
+	std::vector<PxBounds3> hullsBounds(in.size());
+	for (uint32_t i = 0; i < in.size(); ++i)
+	{
+		hullsBounds[i].setEmpty();
+		centers[i] = PxVec3(0, 0, 0);
+		for (uint32_t p = 0; p < in[i].points.size(); ++p)
+		{
+			centers[i] += in[i].points[p];
+			hullsBounds[i].include(in[i].points[p]);
+		}
+		centers[i] = hullsBounds[i].getCenter();
+	}
+
+	Separation params;
+	for (uint32_t hull = 0; hull < in.size(); ++hull)
+	{
+		for (uint32_t hull2 = hull + 1; hull2 < in.size(); ++hull2)
+		{
+			if (chunkDepth[hull] != chunkDepth[hull2])
+			{
+				continue;
+			}
+			if (importerHullsInProximityApexFree(in[hull].points, hullsBounds[hull], PxTransform(PxIdentity), PxVec3(1, 1, 1),
+				in[hull2].points, hullsBounds[hull2], PxTransform(PxIdentity), PxVec3(1, 1, 1), 0.0, &params) == false)
+			{
+				continue;
+			}
+			PxVec3 c1 = centers[hull];
+			PxVec3 c2 = centers[hull2];
+			float d = FLT_MAX;
+			PxVec3 n1;
+			PxVec3 n2;
+			for (uint32_t p = 0; p < in[hull].points.size(); ++p)
+			{
+				float ld = (in[hull].points[p] - c2).magnitude();
+				if (ld < d)
+				{
+					n1 = in[hull].points[p];
+					d = ld;
+				}
+			}
+			d = FLT_MAX;
+			for (uint32_t p = 0; p < in[hull2].points.size(); ++p)
+			{
+				float ld = (in[hull2].points[p] - c1).magnitude();
+				if (ld < d)
+				{
+					n2 = in[hull2].points[p];
+					d = ld;
+				}
+			}
+
+			PxVec3 dir = c2 - c1;
+
+			PxPlane pl = PxPlane((n1 + n2) * 0.5, dir.getNormalized());
+			chunkMidplanes[hull].push_back(pl);
+			PxPlane pl2 = PxPlane((n1 + n2) * 0.5, -dir.getNormalized());
+			chunkMidplanes[hull2].push_back(pl2);		
+		}
+	}
+	std::vector<PxVec3> hPoints;
+	for (uint32_t i = 0; i < in.size(); ++i)
+	{
+		std::vector<Facet> facets;
+		std::vector<Vertex> vertices;
+		std::vector<Edge> edges;
+		for (uint32_t fc = 0; fc < in[i].polygonData.size(); ++fc)
+		{
+			Facet nFc;
+			nFc.firstEdgeNumber = edges.size();
+			uint32_t n = in[i].polygonData[fc].mNbVerts;
+			for (uint32_t ed = 0; ed < n; ++ed)
+			{
+				uint32_t vr1 = in[i].indices[(ed) + in[i].polygonData[fc].mIndexBase];
+				uint32_t vr2 = in[i].indices[(ed + 1) % n + in[i].polygonData[fc].mIndexBase];
+				edges.push_back(Edge(vr1, vr2));
+			}
+			nFc.edgesCount = n;
+			facets.push_back(nFc);
+		}
+		vertices.resize(in[i].points.size());
+		for (uint32_t vr = 0; vr < in[i].points.size(); ++vr)
+		{
+			vertices[vr].p = in[i].points[vr];
+		}
+		Mesh* hullMesh = new Mesh(vertices.data(), edges.data(), facets.data(), vertices.size(), edges.size(), facets.size());
+		BooleanEvaluator evl;
+		Mesh* cuttingMesh = getCuttingBox(PxVec3(0, 0, 0), PxVec3(0, 0, 1), 40, 0);
+		for (uint32_t p = 0; p < chunkMidplanes[i].size(); ++p)
+		{
+			PxPlane& pl = chunkMidplanes[i][p];
+			setCuttingBox(pl.pointInPlane(), pl.n.getNormalized(), cuttingMesh, 60, 0);
+			evl.performFastCutting(hullMesh, cuttingMesh, BooleanConfigurations::BOOLEAN_DIFFERENCE());
+			Mesh* result = evl.createNewMesh();
+			if (result == nullptr)
+			{
+				break;
+			}
+			delete hullMesh;
+			hullMesh = result;
+		}
+		delete cuttingMesh;
+		if (hullMesh == nullptr)
+		{
+			continue;
+		}
+		hPoints.clear();
+		hPoints.resize(hullMesh->getVerticesCount());
+		for (uint32_t v = 0; v < hullMesh->getVerticesCount(); ++v)
+		{
+			hPoints[v] = hullMesh->getVertices()[v].p;
+		}
+		delete hullMesh;
+		buildCollisionGeometry(hPoints, in[i]);
+	}
+}
+
+
+PxConvexMesh* ConvexMeshBuilder::buildConvexMesh(std::vector<PxVec3>& vertexData)
+{
+	CollisionHull hull;
+	buildCollisionGeometry(vertexData, hull);
+
+	PxConvexMeshDesc convexMeshDescr;
+	convexMeshDescr.indices.data = hull.indices.data();
+	convexMeshDescr.indices.count = (uint32_t)hull.indices.size();
+	convexMeshDescr.indices.stride = sizeof(uint32_t);
+
+	convexMeshDescr.points.data = hull.points.data();
+	convexMeshDescr.points.count = (uint32_t)hull.points.size();
+	convexMeshDescr.points.stride = sizeof(PxVec3);
+
+	convexMeshDescr.polygons.data = hull.polygonData.data();
+	convexMeshDescr.polygons.count = (uint32_t)hull.polygonData.size();
+	convexMeshDescr.polygons.stride = sizeof(PxHullPolygon);
+
+	PxConvexMesh* convexMesh = mCooking->createConvexMesh(convexMeshDescr, *mInsertionCallback);
+	return convexMesh;
+}
+
+PxConvexMesh* ConvexMeshBuilder::buildConvexMesh(CollisionHull& hull)
+{	
+	PxConvexMeshDesc convexMeshDescr;
+	convexMeshDescr.indices.data = hull.indices.data();
+	convexMeshDescr.indices.count = (uint32_t)hull.indices.size();
+	convexMeshDescr.indices.stride = sizeof(uint32_t);
+
+	convexMeshDescr.points.data = hull.points.data();
+	convexMeshDescr.points.count = (uint32_t)hull.points.size();
+	convexMeshDescr.points.stride = sizeof(PxVec3);
+
+	convexMeshDescr.polygons.data = hull.polygonData.data();
+	convexMeshDescr.polygons.count = (uint32_t)hull.polygonData.size();
+	convexMeshDescr.polygons.stride = sizeof(PxHullPolygon);
+
+	PxConvexMesh* convexMesh = mCooking->createConvexMesh(convexMeshDescr, *mInsertionCallback);
+	return convexMesh;
+}
+
+
+} // namespace Blast
+} // namespace Nv