quantitativebytes / qbraytrace

Welcome to my new series on building a ray tracer from scratch in C++ with the SDL2 library! Follow me in this 'code with me' style series as I build a simple but functional ray tracer from scratch in C++. As far as possible, I use only the standard libraries, with the addition of SDL2 to allow the display of the final image in a window.

Hi there 👋

I firmly believe that no problem can be solved unless it can first be measured. I specialize in writing software to make quantitative measurements from multi-dimensional raw data, bringing new intelligence to clinical and research problem solving. I primarily code in Matlab, C++ and Python, using whichever tool is most appropriate to the problem at hand. Working at the boundary between data science and software engineering, I have extensive experience of all aspects of research software development, ranging from the design and implementation of fundamental image and signal processing algorithms, through user-interface design and implementation, to statistical analysis and reporting.

I am a passionate believer in the value of sharing my enthusiasm for and knowledge of science and engineering to educate and inspire others. In my spare time I run the QuantitativeBytes YouTube channel for exactly this purpose, with a focus on scientific computing. I create educational content and tutorials on a variety of topics with an emphasis on practical implementation, focusing mostly on development in C++ and Python. You can check it out at the links below:

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qbraytrace's Issues

Problem building EP7

Hi there.
This tutorial is simply great and what I needed to get into RT from scratch!
Thanks a lot!

I'd have a question...
I'm trying to ensure that I can make this code work in my environment (VS Code on Mac) and I found that after EP7 I can't build the code. I can without issues until EP6.
I get errors such as...
Undefined symbols for architecture x86_64: "qbRT::ObjectBase::AssignMaterial(std::__1::shared_ptr<qbRT::MaterialBase> const&)", referenced from: qbRT::Scene::Scene() in scene-7e9451.o "qbRT::ObjectBase::SetTransformMatrix(qbRT::GTform const&)", referenced from: qbRT::Scene::Scene() in scene-7e9451.o "qbRT::PointLight::PointLight()", referenced from: qbRT::Scene::Scene() in scene-7e9451.o "qbRT::PointLight::~PointLight()", referenced from: qbRT::Scene::Scene() in scene-7e9451.o "qbRT::MaterialBase::ComputeDiffuseColor(std::__1::vector<std::__1::shared_ptr<qbRT::ObjectBase>, std::__1::allocator<std::__1::shared_ptr<qbRT::ObjectBase> > > const&, std::__1::vector<std::__1::shared_ptr<qbRT::LightBase>, std::__1::allocator<std::__1::shared_ptr<qbRT::LightBase> > > const&, std::__1::shared_ptr<qbRT::ObjectBase> const&, qbVector<double> const&, qbVector<double> const&, qbVector<double> const&)", referenced from: qbRT::Scene::Render(qbImage&) in scene-7e9451.o "qbRT::MaterialBase::~MaterialBase()", referenced from: qbRT::SimpleMaterial::SimpleMaterial(qbRT::SimpleMaterial const&) in scene-7e9451.o "qbRT::SimpleMaterial::SimpleMaterial()", referenced from: qbRT::Scene::Scene() in scene-7e9451.o "qbRT::SimpleMaterial::~SimpleMaterial()", referenced from: qbRT::Scene::Scene() in scene-7e9451.o "qbRT::ObjPlane::ObjPlane()", referenced from: qbRT::Scene::Scene() in scene-7e9451.o "qbRT::ObjPlane::~ObjPlane()", referenced from: qbRT::Scene::Scene() in scene-7e9451.o "qbRT::ObjSphere::ObjSphere()", referenced from: qbRT::Scene::Scene() in scene-7e9451.o "qbRT::ObjSphere::~ObjSphere()", referenced from: qbRT::Scene::Scene() in scene-7e9451.o "vtable for qbRT::ObjectBase", referenced from: qbRT::ObjectBase::ObjectBase(qbRT::ObjectBase const&) in scene-7e9451.o NOTE: a missing vtable usually means the first non-inline virtual member function has no definition. "vtable for qbRT::PointLight", referenced from: qbRT::PointLight::PointLight(qbRT::PointLight const&) in scene-7e9451.o NOTE: a missing vtable usually means the first non-inline virtual member function has no definition. "vtable for qbRT::MaterialBase", referenced from: qbRT::MaterialBase::MaterialBase(qbRT::MaterialBase const&) in scene-7e9451.o NOTE: a missing vtable usually means the first non-inline virtual member function has no definition. "vtable for qbRT::SimpleMaterial", referenced from: qbRT::SimpleMaterial::SimpleMaterial(qbRT::SimpleMaterial const&) in scene-7e9451.o NOTE: a missing vtable usually means the first non-inline virtual member function has no definition. "vtable for qbRT::ObjPlane", referenced from: qbRT::ObjPlane::ObjPlane(qbRT::ObjPlane const&) in scene-7e9451.o NOTE: a missing vtable usually means the first non-inline virtual member function has no definition. "vtable for qbRT::LightBase", referenced from: qbRT::LightBase::LightBase(qbRT::LightBase const&) in scene-7e9451.o NOTE: a missing vtable usually means the first non-inline virtual member function has no definition. "vtable for qbRT::ObjSphere", referenced from: qbRT::ObjSphere::ObjSphere(qbRT::ObjSphere const&) in scene-7e9451.o NOTE: a missing vtable usually means the first non-inline virtual member function has no definition. ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)

What is different in this Episode that prevents me of building?
Thanks again a regards!