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compute polyvox collision hull differently for marching-cube surfaces

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This commit is contained in:
Seth Alves 2015-08-15 11:25:27 -07:00
parent 9706a44ca1
commit 27e5322cb4
1 changed files with 91 additions and 41 deletions
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132
libraries/entities-renderer/src/RenderablePolyVoxEntityItem.cpp
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@ -40,7 +40,7 @@
#include "EntityTreeRenderer.h"
#include "polyvox_vert.h"
#include "polyvox_frag.h"
#include "RenderablePolyVoxEntityItem.h"
#include "RenderablePolyVoxEntityItem.h"
gpu::PipelinePointer RenderablePolyVoxEntityItem::_pipeline = nullptr;
@ -553,53 +553,103 @@ void RenderablePolyVoxEntityItem::computeShapeInfo(ShapeInfo& info) {
}
_points.clear();
unsigned int i = 0;
glm::mat4 wToM = voxelToLocalMatrix();
AABox box;
glm::mat4 vtoM = voxelToLocalMatrix();
for (int z = 0; z < _voxelVolumeSize.z; z++) {
for (int y = 0; y < _voxelVolumeSize.y; y++) {
for (int x = 0; x < _voxelVolumeSize.x; x++) {
if (getVoxel(x, y, z) > 0) {
QVector<glm::vec3> pointsInPart;
if (_voxelSurfaceStyle == PolyVoxEntityItem::SURFACE_MARCHING_CUBES) {
unsigned int i = 0;
/* pull top-facing triangles into polyhedrons so they can be walked on */
const model::MeshPointer& mesh = _modelGeometry.getMesh();
const gpu::BufferView vertexBufferView = mesh->getVertexBuffer();
const gpu::BufferView& indexBufferView = mesh->getIndexBuffer();
gpu::BufferView::Iterator<const uint32_t> it = indexBufferView.cbegin<uint32_t>();
while (it != indexBufferView.cend<uint32_t>()) {
uint32_t p0Index = *(it++);
uint32_t p1Index = *(it++);
uint32_t p2Index = *(it++);
float offL = -0.5f;
float offH = 0.5f;
const glm::vec3 p0 = vertexBufferView.get<const glm::vec3>(p0Index);
const glm::vec3 p1 = vertexBufferView.get<const glm::vec3>(p1Index);
const glm::vec3 p2 = vertexBufferView.get<const glm::vec3>(p2Index);
glm::vec3 p000 = glm::vec3(wToM * glm::vec4(x + offL, y + offL, z + offL, 1.0f));
glm::vec3 p001 = glm::vec3(wToM * glm::vec4(x + offL, y + offL, z + offH, 1.0f));
glm::vec3 p010 = glm::vec3(wToM * glm::vec4(x + offL, y + offH, z + offL, 1.0f));
glm::vec3 p011 = glm::vec3(wToM * glm::vec4(x + offL, y + offH, z + offH, 1.0f));
glm::vec3 p100 = glm::vec3(wToM * glm::vec4(x + offH, y + offL, z + offL, 1.0f));
glm::vec3 p101 = glm::vec3(wToM * glm::vec4(x + offH, y + offL, z + offH, 1.0f));
glm::vec3 p110 = glm::vec3(wToM * glm::vec4(x + offH, y + offH, z + offL, 1.0f));
glm::vec3 p111 = glm::vec3(wToM * glm::vec4(x + offH, y + offH, z + offH, 1.0f));
qDebug() << p0Index << p1Index << p2Index;
qDebug() << (int)p0.x << (int)p0.y << (int)p0.z;
box += p000;
box += p001;
box += p010;
box += p011;
box += p100;
box += p101;
box += p110;
box += p111;
glm::vec3 av = (p0 + p1 + p2) / 3.0f; // center of the triangular face
glm::vec3 normal = glm::normalize(glm::cross(p1 - p0, p2 - p0));
float threshold = 1.0f / sqrtf(3.0f);
if (normal.y > -threshold && normal.y < threshold) {
// this triangle is more a wall than a floor, skip it.
} else {
float dropAmount = 2.0f; // XXX magic
glm::vec3 p3 = av - glm::vec3(0.0f, dropAmount, 0.0f);
pointsInPart << p000;
pointsInPart << p001;
pointsInPart << p010;
pointsInPart << p011;
pointsInPart << p100;
pointsInPart << p101;
pointsInPart << p110;
pointsInPart << p111;
glm::vec3 p0Model = glm::vec3(vtoM * glm::vec4(p0, 1.0f));
glm::vec3 p1Model = glm::vec3(vtoM * glm::vec4(p1, 1.0f));
glm::vec3 p2Model = glm::vec3(vtoM * glm::vec4(p2, 1.0f));
glm::vec3 p3Model = glm::vec3(vtoM * glm::vec4(p3, 1.0f));
// add next convex hull
QVector<glm::vec3> newMeshPoints;
_points << newMeshPoints;
// add points to the new convex hull
_points[i++] << pointsInPart;
box += p0Model;
box += p1Model;
box += p2Model;
box += p3Model;
QVector<glm::vec3> pointsInPart;
pointsInPart << p0Model;
pointsInPart << p1Model;
pointsInPart << p2Model;
pointsInPart << p3Model;
// add next convex hull
QVector<glm::vec3> newMeshPoints;
_points << newMeshPoints;
// add points to the new convex hull
_points[i++] << pointsInPart;
}
}
} else {
unsigned int i = 0;
for (int z = 0; z < _voxelVolumeSize.z; z++) {
for (int y = 0; y < _voxelVolumeSize.y; y++) {
for (int x = 0; x < _voxelVolumeSize.x; x++) {
if (getVoxel(x, y, z) > 0) {
QVector<glm::vec3> pointsInPart;
float offL = -0.5f;
float offH = 0.5f;
glm::vec3 p000 = glm::vec3(vtoM * glm::vec4(x + offL, y + offL, z + offL, 1.0f));
glm::vec3 p001 = glm::vec3(vtoM * glm::vec4(x + offL, y + offL, z + offH, 1.0f));
glm::vec3 p010 = glm::vec3(vtoM * glm::vec4(x + offL, y + offH, z + offL, 1.0f));
glm::vec3 p011 = glm::vec3(vtoM * glm::vec4(x + offL, y + offH, z + offH, 1.0f));
glm::vec3 p100 = glm::vec3(vtoM * glm::vec4(x + offH, y + offL, z + offL, 1.0f));
glm::vec3 p101 = glm::vec3(vtoM * glm::vec4(x + offH, y + offL, z + offH, 1.0f));
glm::vec3 p110 = glm::vec3(vtoM * glm::vec4(x + offH, y + offH, z + offL, 1.0f));
glm::vec3 p111 = glm::vec3(vtoM * glm::vec4(x + offH, y + offH, z + offH, 1.0f));
box += p000;
box += p001;
box += p010;
box += p011;
box += p100;
box += p101;
box += p110;
box += p111;
pointsInPart << p000;
pointsInPart << p001;
pointsInPart << p010;
pointsInPart << p011;
pointsInPart << p100;
pointsInPart << p101;
pointsInPart << p110;
pointsInPart << p111;
// add next convex hull
QVector<glm::vec3> newMeshPoints;
_points << newMeshPoints;
// add points to the new convex hull
_points[i++] << pointsInPart;
}
}
}
}