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/*
* Copyright (c) 2008-2017, 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 "ClothMeshGenerator.h"
void ClothMeshData::Clear()
{
mVertices.clear();
mTriangles.clear();
mQuads.clear();
}
void ClothMeshData::GeneratePlaneCloth(float width, float height, int segmentsX, int segmentsY, bool createQuads, physx::PxMat44 transform, bool alternatingDiagonals, int zigzag)
{
/*
GeneratePlaneCloth(x,y,2,2) generates:
v0______v1_____v2 v0______v1_____v2
| | | |\ |\ |
| Q0 | Q1 | | \t0 | \t2 |
| | | | t1 \ | t3 \ |
v3------v4-----v5 v3-----\v4----\v5
| | | | \ | \ |
| Q2 | Q3 | | \t4| \t6|
|______|______| |_t5_\_|_t7__\|
v6 v7 v8 v6 v7 v8
*/
// Submesh submesh;
Clear();
mVertices.resize((segmentsX + 1) * (segmentsY + 1));
mInvMasses.resize((segmentsX + 1) * (segmentsY + 1));
mTriangles.resize(segmentsX * segmentsY * 2);
if (createQuads)
mQuads.resize(segmentsX * segmentsY);
mMesh.vertices.resize(mVertices.size());
mMesh.indices.resize(3 * mTriangles.size());
physx::PxVec3 topLeft(-width * 0.5f, 0.f, -height * 0.5f);
// vec3 topLeftGLM(-width * 0.5f, translateUp, -height * 0.5f);
//calculate uv scale and offset to keep texture aspect ratio 1:1
float uvSx = width > height ? 1.0f : width / height;
float uvSy = width > height ? height / width : 1.0f;
float uvOx = 0.5f * (1.0f - uvSx);
float uvOy = 0.5f * (1.0f - uvSy);
// Vertices
for (int y = 0; y < segmentsY + 1; y++)
{
for(int x = 0; x < segmentsX + 1; x++)
{
physx::PxVec3 pos;
switch(zigzag)
{
case 1:
pos = physx::PxVec3(((float)x / (float)segmentsX) * width,
sinf(y*0.5)/(float)segmentsY * height,
((float)y / (float)segmentsY) * height);
break;
case 2:
pos = physx::PxVec3(((float)x / (float)segmentsX) * width,
((float)(y&2) / (float)segmentsY) * height,
((float)((y+1)&~1) / (float)segmentsY) * height);
break;
default:
pos = physx::PxVec3(((float)x / (float)segmentsX) * width,
0.f,
((float)y / (float)segmentsY) * height);
}
mVertices[x + y * (segmentsX + 1)] = transform.transform(topLeft + pos);
mInvMasses[x + y * (segmentsX + 1)] = 1.0f;
mMesh.vertices[x + y * (segmentsX + 1)].position = transform.transform(topLeft + pos);
mMesh.vertices[x + y * (segmentsX + 1)].normal = transform.transform(physx::PxVec3(0.f, 1.f, 0.f));
mMesh.vertices[x + y * (segmentsX + 1)].uv = physx::PxVec2(uvOx + uvSx*(float)x / (float)segmentsX, uvOy + uvSy*(1.0f - (float)y / (float)segmentsY));
}
}
if (createQuads)
{
// Quads
for (int y = 0; y < segmentsY; y++)
{
for (int x = 0; x < segmentsX; x++)
{
mQuads[(x + y * segmentsX)] = Quad((uint32_t)(x + 0) + (y + 0) * (segmentsX + 1),
(uint32_t)(x + 1) + (y + 0) * (segmentsX + 1),
(uint32_t)(x + 1) + (y + 1) * (segmentsX + 1),
(uint32_t)(x + 0) + (y + 1) * (segmentsX + 1));
}
}
}
// Triangles
for (int y = 0; y < segmentsY; y++)
{
for(int x = 0; x < segmentsX; x++)
{
if(alternatingDiagonals && (x^y)&1)
{
//Top right to bottom left
mTriangles[(x + y * segmentsX) * 2 + 0] = Triangle( (uint32_t)(x + 0) + (y + 0) * (segmentsX + 1),
(uint32_t)(x + 1) + (y + 0) * (segmentsX + 1),
(uint32_t)(x + 0) + (y + 1) * (segmentsX + 1));
mTriangles[(x + y * segmentsX) * 2 + 1] = Triangle( (uint32_t)(x + 1) + (y + 0) * (segmentsX + 1),
(uint32_t)(x + 1) + (y + 1) * (segmentsX + 1),
(uint32_t)(x + 0) + (y + 1) * (segmentsX + 1));
}
else
{
//Top left to bottom right
mTriangles[(x + y * segmentsX) * 2 + 0] = Triangle( (uint32_t)(x + 0) + (y + 0) * (segmentsX + 1),
(uint32_t)(x + 1) + (y + 0) * (segmentsX + 1),
(uint32_t)(x + 1) + (y + 1) * (segmentsX + 1));
mTriangles[(x + y * segmentsX) * 2 + 1] = Triangle( (uint32_t)(x + 0) + (y + 0) * (segmentsX + 1),
(uint32_t)(x + 1) + (y + 1) * (segmentsX + 1),
(uint32_t)(x + 0) + (y + 1) * (segmentsX + 1));
}
}
}
for (int i = 0; i < (int)mTriangles.size(); i++)
{
mMesh.indices[3 * i] = mTriangles[i].a;
mMesh.indices[3 * i + 1] = mTriangles[i].b;
mMesh.indices[3 * i + 2] = mTriangles[i].c;
}
}
void ClothMeshData::AttachClothPlaneByAngles(int segmentsX, int segmentsY, bool attachByWidth)
{
for (int y = 0; y < segmentsY + 1; y++)
for (int x = 0; x < segmentsX + 1; x++)
if ((attachByWidth && y == 0) || (!attachByWidth && x == 0))
if (x == 0 || x == segmentsX)
mInvMasses[x + y * (segmentsX + 1)] = 0.0f;
}
void ClothMeshData::AttachClothPlaneBySide(int segmentsX, int segmentsY, bool attachByWidth)
{
for (int y = 0; y < segmentsY + 1; y++)
for (int x = 0; x < segmentsX + 1; x++)
if ((attachByWidth && y == 0) || (!attachByWidth && x == 0))
mInvMasses[x + y * (segmentsX + 1)] = 0.0f;
}
void ClothMeshData::SetInvMasses(float invMass)
{
// Doesn't modify attached vertices
for (int i = 0; i < (int)mInvMasses.size(); ++i)
if (mInvMasses[i] > 1e-6f)
mInvMasses[i] = invMass;
}
void ClothMeshData::SetInvMassesFromDensity(float density)
{
// Tempt code, should take into account triangle's areas
// Doesn't modify attached vertices
for (int i = 0; i < (int)mInvMasses.size(); ++i)
if (mInvMasses[i] > 1e-6f)
mInvMasses[i] = 1.f / density;
}
template <typename T>
nv::cloth::BoundedData ToBoundedData(T& vector)
{
nv::cloth::BoundedData d;
d.data = &vector[0];
d.stride = sizeof(vector[0]);
d.count = (physx::PxU32)vector.size();
return d;
}
nv::cloth::ClothMeshDesc ClothMeshData::GetClothMeshDesc()
{
nv::cloth::ClothMeshDesc d;
d.setToDefault();
d.points = ToBoundedData(mVertices);
if (mQuads.size() != 0)
d.quads = ToBoundedData(mQuads);
if (mTriangles.size() != 0)
d.triangles = ToBoundedData(mTriangles);
d.invMasses = ToBoundedData(mInvMasses);
return d;
}
SimpleMesh ClothMeshData::GetRenderMesh()
{
return mMesh;
}
void ClothMeshData::Merge(const ClothMeshData& other)
{
uint32_t firstVertex = (uint32_t)mVertices.size();
uint32_t firstTriangle = (uint32_t)mTriangles.size();
uint32_t firstQuad = (uint32_t)mQuads.size();
mVertices.insert(mVertices.end(), other.mVertices.begin(), other.mVertices.end());
mUvs.insert(mUvs.end(), other.mUvs.begin(), other.mUvs.end());
mInvMasses.insert(mInvMasses.end(), other.mInvMasses.begin(), other.mInvMasses.end());
mMesh.vertices.insert(mMesh.vertices.end(), mMesh.vertices.begin(), mMesh.vertices.end());
for(const auto& t : other.mTriangles)
{
mTriangles.push_back(t + firstVertex);
}
for(const auto& q : other.mQuads)
{
mQuads.push_back(q + firstVertex);
mMesh.indices.push_back(mQuads.back().a);
mMesh.indices.push_back(mQuads.back().b);
mMesh.indices.push_back(mQuads.back().c);
}
}
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