void Primitive::setupTangentFrame(const IntersectionTemporary &data,
const IntersectionInfo &info, TangentFrame &dst) const
{
const Texture *bump = info.bsdf ? info.bsdf->bump().get() : nullptr;
if ((!bump || bump->isConstant()) && !info.bsdf->lobes().isAnisotropic()) {
dst = TangentFrame(info.Ns);
return;
}
Vec3f T, B, N(info.Ns);
if (!tangentSpace(data, info, T, B)) {
dst = TangentFrame(info.Ns);
return;
}
if (bump && !bump->isConstant()) {
Vec2f dudv;
bump->derivatives(info.uv, dudv);
T += info.Ns*(dudv.x() - info.Ns.dot(T));
B += info.Ns*(dudv.y() - info.Ns.dot(B));
N = T.cross(B);
if (N == 0.0f) {
dst = TangentFrame(info.Ns);
return;
}
if (N.dot(info.Ns) < 0.0f)
N = -N;
N.normalize();
}
T = (T - N.dot(T)*N);
if (T == 0.0f) {
dst = TangentFrame(info.Ns);
return;
}
T.normalize();
B = N.cross(T);
dst = TangentFrame(N, T, B);
}
int main(void)
{
GLFWwindow* window;
camera = new Camera();
fov = 67;
con = 0.0;
int width, height;
glfwSetErrorCallback(error_callback);
if (!glfwInit())
exit(EXIT_FAILURE);
window = glfwCreateWindow(1600, 900, "Simple example", glfwGetPrimaryMonitor(), NULL);
if (!window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(window);
glfwSwapInterval(1);
glewInit();
glfwSetKeyCallback(window, key_callback);
glfwGetFramebufferSize(window, &width, &height);
glViewport(0, 0, width, height);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glDisable(GL_CULL_FACE);
Quad* quad = new Quad;
Shader * geom = new Shader("geometry.vert", "geometry.frag");
geom->setAttribute(0, "point");
geom->linkProgram();
geom->bind();
geom->unbind();
float deltaTime = float(0.005);
while (!glfwWindowShouldClose(window))
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glDepthMask(GL_TRUE);
camera->Update();
geom->bind();
geom->passUniform(camera->position, "position");
geom->passUniform(camera->direction, "direction");
geom->passUniform(camera->upVector, "upVector");
geom->passUniform(camera->viewMatrix, "viewMatrix");
geom->passUniform(camera->projectionMatrix, "projectionMatrix");
geom->passUniform(con, "con");
quad->Render();
geom->unbind();
glDepthMask(GL_TRUE);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
for (int i = 0; i < wave.size(); ++i) {
mat3 tangentSpace(wave[i].bitangent, wave[i].normal, wave[i].tangent);
float previousDistance = wave[i].distance;
wave[i].position += tangentSpace * wave[i].direction * deltaTime;
wave[i].distance = sdTorus(wave[i].position);
wave[i].position += wave[i].normal * wave[i].distance;
wave[i].normal = getNormal(wave[i].position);
vec3 tangent, bitangent, normal;
vec3 position = wave[i].position;
normal = wave[i].normal;
mat4 rotation = glm::rotate(0.05f, vec3(0, 1.0, 0));
vec3 delta = vec3( rotation*vec4(position, 1.0) );
tangent = delta - wave[i].position;
tangent = normalize(tangent);
bitangent = cross(tangent, normal);
wave[i].bitangent = bitangent;
wave[i].tangent = tangent;
}
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(67.3801, (GLfloat)1600.0 / (GLfloat)900.0, 0.5, 50.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(
camera->position.x, camera->position.y, camera->position.z,
camera->position.x + camera->direction.x,
camera->position.y + camera->direction.y,
camera->position.z + camera->direction.z,
camera->upVector.x, camera->upVector.y, camera->upVector.z);
if (wave.size() > 0) {
vec3 arr[800];
glBegin(GL_LINE_LOOP);
for (int i = 0; i < 800; ++i){
arr[i] = wave[i].position;
glColor3f(1.0, 1.0, 1.0);
glVertex3f(arr[i].x, arr[i].y, arr[i].z);
/*
glBegin(GL_LINE_LOOP);
glColor3f(1.0, 0.0, 0.0);
arr[i] = wave[i].position;
vec3 nrm = wave[i].normal * float(0.1);
glVertex3f(arr[i].x, arr[i].y, arr[i].z);
glVertex3f(arr[i].x+nrm.x, arr[i].y +nrm.y, arr[i].z+nrm.z);
glEnd();
glBegin(GL_LINE_LOOP);
glColor3f(0.0, 1.0, 0.0);
arr[i] = wave[i].position;
nrm = wave[i].tangent * float(0.1);
glVertex3f(arr[i].x, arr[i].y, arr[i].z);
glVertex3f(arr[i].x + nrm.x, arr[i].y + nrm.y, arr[i].z + nrm.z);
glEnd();
glBegin(GL_LINE_LOOP);
glColor3f(0.0, 0.0, 1.0);
arr[i] = wave[i].position;
nrm = wave[i].bitangent * float(0.1);
glVertex3f(arr[i].x, arr[i].y, arr[i].z);
glVertex3f(arr[i].x + nrm.x, arr[i].y + nrm.y, arr[i].z + nrm.z);
glEnd();
*/
}
glEnd();
}
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwDestroyWindow(window);
glfwTerminate();
exit(EXIT_SUCCESS);
}
