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// Copyright 2009-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#include "../common/tutorial/tutorial.h"
#include "../common/tutorial/tutorial_device.h"
#include "../../include/embree4/rtcore.h"
RTC_NAMESPACE_USE
#include "../../kernels/bvh/bvh.h"
#include "../../kernels/geometry/trianglev.h"
namespace embree
{
/* error reporting function */
void error_handler(void* userPtr, const RTCError code, const char* str)
{
if (code == RTC_ERROR_NONE)
return;
printf("Embree: ");
switch (code) {
case RTC_ERROR_UNKNOWN : printf("RTC_ERROR_UNKNOWN"); break;
case RTC_ERROR_INVALID_ARGUMENT : printf("RTC_ERROR_INVALID_ARGUMENT"); break;
case RTC_ERROR_INVALID_OPERATION: printf("RTC_ERROR_INVALID_OPERATION"); break;
case RTC_ERROR_OUT_OF_MEMORY : printf("RTC_ERROR_OUT_OF_MEMORY"); break;
case RTC_ERROR_UNSUPPORTED_CPU : printf("RTC_ERROR_UNSUPPORTED_CPU"); break;
case RTC_ERROR_CANCELLED : printf("RTC_ERROR_CANCELLED"); break;
default : printf("invalid error code"); break;
}
if (str) {
printf(" (");
while (*str) putchar(*str++);
printf(")\n");
}
exit(1);
}
/* adds a cube to the scene */
unsigned int addCube (RTCDevice device_i, RTCScene scene_i, const Vec3fa& pos)
{
/* create a triangulated cube with 12 triangles and 8 vertices */
RTCGeometry mesh = rtcNewGeometry (device_i, RTC_GEOMETRY_TYPE_TRIANGLE);
/* set vertices */
Vec3fa* vertices = (Vec3fa*) rtcSetNewGeometryBuffer(mesh, RTC_BUFFER_TYPE_VERTEX, 0, RTC_FORMAT_FLOAT3, sizeof(Vec3fa), 8);
vertices[0].x = pos.x + -1; vertices[0].y = pos.y + -1; vertices[0].z = pos.z + -1;
vertices[1].x = pos.x + -1; vertices[1].y = pos.y + -1; vertices[1].z = pos.z + +1;
vertices[2].x = pos.x + -1; vertices[2].y = pos.y + +1; vertices[2].z = pos.z + -1;
vertices[3].x = pos.x + -1; vertices[3].y = pos.y + +1; vertices[3].z = pos.z + +1;
vertices[4].x = pos.x + +1; vertices[4].y = pos.y + -1; vertices[4].z = pos.z + -1;
vertices[5].x = pos.x + +1; vertices[5].y = pos.y + -1; vertices[5].z = pos.z + +1;
vertices[6].x = pos.x + +1; vertices[6].y = pos.y + +1; vertices[6].z = pos.z + -1;
vertices[7].x = pos.x + +1; vertices[7].y = pos.y + +1; vertices[7].z = pos.z + +1;
/* set triangles */
int tri = 0;
Triangle* triangles = (Triangle*) rtcSetNewGeometryBuffer(mesh, RTC_BUFFER_TYPE_INDEX, 0, RTC_FORMAT_UINT3, sizeof(Triangle), 12);
// left side
triangles[tri].v0 = 0; triangles[tri].v1 = 2; triangles[tri].v2 = 1; tri++;
triangles[tri].v0 = 1; triangles[tri].v1 = 2; triangles[tri].v2 = 3; tri++;
// right side
triangles[tri].v0 = 4; triangles[tri].v1 = 5; triangles[tri].v2 = 6; tri++;
triangles[tri].v0 = 5; triangles[tri].v1 = 7; triangles[tri].v2 = 6; tri++;
// bottom side
triangles[tri].v0 = 0; triangles[tri].v1 = 1; triangles[tri].v2 = 4; tri++;
triangles[tri].v0 = 1; triangles[tri].v1 = 5; triangles[tri].v2 = 4; tri++;
// top side
triangles[tri].v0 = 2; triangles[tri].v1 = 6; triangles[tri].v2 = 3; tri++;
triangles[tri].v0 = 3; triangles[tri].v1 = 6; triangles[tri].v2 = 7; tri++;
// front side
triangles[tri].v0 = 0; triangles[tri].v1 = 4; triangles[tri].v2 = 2; tri++;
triangles[tri].v0 = 2; triangles[tri].v1 = 4; triangles[tri].v2 = 6; tri++;
// back side
triangles[tri].v0 = 1; triangles[tri].v1 = 3; triangles[tri].v2 = 5; tri++;
triangles[tri].v0 = 3; triangles[tri].v1 = 7; triangles[tri].v2 = 5; tri++;
rtcCommitGeometry(mesh);
unsigned int geomID = rtcAttachGeometry(scene_i,mesh);
rtcReleaseGeometry(mesh);
return geomID;
}
/* adds a ground plane to the scene */
unsigned int addGroundPlane (RTCDevice device_i, RTCScene scene_i)
{
/* create a triangulated plane with 2 triangles and 4 vertices */
RTCGeometry mesh = rtcNewGeometry (device_i, RTC_GEOMETRY_TYPE_TRIANGLE);
/* set vertices */
Vec3fa* vertices = (Vec3fa*) rtcSetNewGeometryBuffer(mesh, RTC_BUFFER_TYPE_VERTEX, 0, RTC_FORMAT_FLOAT3, sizeof(Vec3fa), 4);
vertices[0].x = -10; vertices[0].y = -2; vertices[0].z = -10;
vertices[1].x = -10; vertices[1].y = -2; vertices[1].z = +10;
vertices[2].x = +10; vertices[2].y = -2; vertices[2].z = -10;
vertices[3].x = +10; vertices[3].y = -2; vertices[3].z = +10;
/* set triangles */
Triangle* triangles = (Triangle*) rtcSetNewGeometryBuffer(mesh, RTC_BUFFER_TYPE_INDEX, 0, RTC_FORMAT_UINT3, sizeof(Triangle), 2);
triangles[0].v0 = 0; triangles[0].v1 = 2; triangles[0].v2 = 1;
triangles[1].v0 = 1; triangles[1].v1 = 2; triangles[1].v2 = 3;
rtcCommitGeometry(mesh);
unsigned int geomID = rtcAttachGeometry(scene_i,mesh);
rtcReleaseGeometry(mesh);
return geomID;
}
/* adds a hair to the scene */
unsigned int addHair(RTCDevice device_i, RTCScene scene_i)
{
RTCGeometry geom = rtcNewGeometry (device_i, RTC_GEOMETRY_TYPE_ROUND_BEZIER_CURVE);
vfloat4* pos = (vfloat4*) rtcSetNewGeometryBuffer(geom, RTC_BUFFER_TYPE_VERTEX, 0, RTC_FORMAT_FLOAT4, sizeof(vfloat4), 4);
pos[0] = vfloat4(0.0f,0.0f,0.0f,0.1f);
pos[1] = vfloat4(0.0f,1.0f,0.0f,0.1f);
pos[2] = vfloat4(0.0f,2.0f,0.0f,0.1f);
pos[3] = vfloat4(0.0f,3.0f,0.0f,0.1f);
int* index = (int*) rtcSetNewGeometryBuffer(geom, RTC_BUFFER_TYPE_INDEX, 0, RTC_FORMAT_UINT, sizeof(int), 1);
index[0] = 0;
rtcCommitGeometry(geom);
unsigned int geomID = rtcAttachGeometry(scene_i,geom);
rtcReleaseGeometry(geom);
return geomID;
}
/* prints the bvh4.triangle4v data structure */
void print_bvh4_triangle4v(BVH4::NodeRef node, size_t depth)
{
if (node.isAABBNode())
{
BVH4::AABBNode* n = node.getAABBNode();
std::cout << "AABBNode {" << std::endl;
for (size_t i=0; i<4; i++)
{
for (size_t k=0; k<depth; k++) std::cout << " ";
std::cout << " bounds" << i << " = " << n->bounds(i) << std::endl;
}
for (size_t i=0; i<4; i++)
{
if (n->child(i) == BVH4::emptyNode)
continue;
for (size_t k=0; k<depth; k++) std::cout << " ";
std::cout << " child" << i << " = ";
print_bvh4_triangle4v(n->child(i),depth+1);
}
for (size_t k=0; k<depth; k++) std::cout << " ";
std::cout << "}" << std::endl;
}
else
{
size_t num;
const Triangle4v* tri = (const Triangle4v*) node.leaf(num);
std::cout << "Leaf {" << std::endl;
for (size_t i=0; i<num; i++) {
for (size_t j=0; j<tri[i].size(); j++) {
for (size_t k=0; k<depth; k++) std::cout << " ";
std::cout << " Triangle { v0 = (" << tri[i].v0.x[j] << ", " << tri[i].v0.y[j] << ", " << tri[i].v0.z[j] << "), "
"v1 = (" << tri[i].v1.x[j] << ", " << tri[i].v1.y[j] << ", " << tri[i].v1.z[j] << "), "
"v2 = (" << tri[i].v2.x[j] << ", " << tri[i].v2.y[j] << ", " << tri[i].v2.z[j] << "), "
"geomID = " << tri[i].geomID(j) << ", primID = " << tri[i].primID(j) << " }" << std::endl;
}
}
for (size_t k=0; k<depth; k++) std::cout << " ";
std::cout << "}" << std::endl;
}
}
/* prints the triangle BVH of a scene */
void print_bvh(RTCScene scene)
{
BVH4* bvh4 = nullptr;
/* if the scene contains only triangles, the BVH4 acceleration structure can be obtained this way */
AccelData* accel = ((Accel*)scene)->intersectors.ptr;
if (accel->type == AccelData::TY_BVH4)
bvh4 = (BVH4*)accel;
/* if there are also other geometry types, one has to iterate over the toplevel AccelN structure */
else if (accel->type == AccelData::TY_ACCELN)
{
AccelN* accelN = (AccelN*)(accel);
for (size_t i=0; i<accelN->accels.size(); i++) {
if (accelN->accels[i]->intersectors.ptr->type == AccelData::TY_BVH4) {
bvh4 = (BVH4*)accelN->accels[i]->intersectors.ptr;
if (std::string(bvh4->primTy->name()) == "triangle4v") break;
bvh4 = nullptr;
}
}
}
if (bvh4 == nullptr)
throw std::runtime_error("cannot access BVH4 acceleration structure"); // will not happen if you use this Embree version
/* now lets print the entire hierarchy */
print_bvh4_triangle4v(bvh4->root,0);
}
/* main function in embree namespace */
int main(int argc, char** argv)
{
/* for best performance set FTZ and DAZ flags in MXCSR control and status register */
_MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
_MM_SET_DENORMALS_ZERO_MODE(_MM_DENORMALS_ZERO_ON);
/* create new Embree device and force bvh4.triangle4v hierarchy for triangles */
RTCDevice device = rtcNewDevice("tri_accel=bvh4.triangle4v");
error_handler(nullptr,rtcGetDeviceError(device));
/* set error handler */
rtcSetDeviceErrorFunction(device,error_handler,nullptr);
/* create scene */
RTCScene scene = rtcNewScene(device);
addCube(device,scene,Vec3fa(-1,0,0));
addCube(device,scene,Vec3fa(1,0,0));
addCube(device,scene,Vec3fa(0,0,-1));
addCube(device,scene,Vec3fa(0,0,1));
addHair(device,scene);
addGroundPlane(device,scene);
rtcCommitScene (scene);
/* print triangle BVH */
print_bvh(scene);
/* cleanup */
rtcReleaseScene (scene);
rtcReleaseDevice(device);
/* wait for user input under Windows when opened in separate window */
waitForKeyPressedUnderWindows();
return 0;
}
}
int main(int argc, char** argv)
{
try {
return embree::main(argc, argv);
}
catch (const std::exception& e) {
std::cout << "Error: " << e.what() << std::endl;
return 1;
}
catch (...) {
std::cout << "Error: unknown exception caught." << std::endl;
return 1;
}
}
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