[42Seoul] 미니알티 사이트

fov

• https://www.scratchapixel.com/lessons/3d-basic-rendering/ray-tracing-generating-camera-rays/generating-camera-rays
  

diffuse

• https://openprocessing.org/sketch/867960
• https://www.scratchapixel.com/lessons/3d-basic-rendering/phong-shader-BRDF
• !!! https://github.dev/lrcouto/MiniRT

t_rgba		lighting(t_comps args, t_light *current_light, int in_shadow)
{
	t_ltparams	params;

	set_light_params(&args, &params, current_light);
	if (params.light_dot_normal < 0 || in_shadow == 1)
	{
		params.diffuse = create_tuple(0, 0, 0, 0);
		params.specular = create_tuple(0, 0, 0, 0);
	}
	else
	{
		params.diffuse = scalar_x_tuple(params.effective_color,
		(args.phong.diffuse * params.light_dot_normal));
		params.reflect_v = reflect(negate_tuple(params.light_v),
			args.normal_vec);
		params.reflect_dot_eye = dot_product(params.reflect_v, args.eye_vec);
		if (params.reflect_dot_eye <= 0)
			params.specular = create_tuple(0, 0, 0, 0);
		else
			params.specular = scalar_x_tuple(rgba_to_tuple(
			current_light->intensity), args.phong.specular *
			(pow(params.reflect_dot_eye, args.phong.shininess)));
	}
	return (tuple_to_rgba(add_tuple(params.ambient,
	add_tuple(params.diffuse, params.specular))));
}

• $diffuse = (albedo) \ (Light\ Intensity) \ (\cos(\theta))$
• $\theta =$ angle between L and N

specular

• $R = 2(L·N)N - L$
• $specular = (Light\ Intensity)\ (V⋅R)^n$

cone

• https://www.shadertoy.com/view/MtcXWr
• https://lousodrome.net/blog/light/2017/01/03/intersection-of-a-ray-and-a-cone/
  
  

checker board

• https://github.com/miniRT-jiphyeonjeon/MiniRT/wiki/Checkerboard
• http://www.bentonian.com/Lectures/AdvGraph1314/3.%20Ray%20tracing%20-%20color%20and%20texture.pdf
• http://luthuli.cs.uiuc.edu/~daf/courses/ComputerGraphics/Week8/Shading.pdf
• https://www.youtube.com/watch?v=5fuE4mTu8Cg
• http://web.cse.ohio-state.edu/~shen.94/681/Site/Slides_files/texture.pdf
  
• https://en.wikipedia.org/wiki/Procedural_texture

uv mapping

• https://en.wikipedia.org/wiki/UV_mapping
• https://youtu.be/5fuE4mTu8Cg?t=1970
  

bump map

• https://ko.wikipedia.org/wiki/%EB%B2%94%ED%94%84_%EB%A7%A4%ED%95%91
• https://sbcode.net/threejs/normalmap/
• http://www.geeks3d.com/20130122/normal-mapping-without-precomputed-tangent-space-vectors/
• https://www.creativebloq.com/features/a-beginners-guide-to-displacement-and-bump-maps
• https://learnopengl.com/Advanced-Lighting/Normal-Mapping
• https://www.slideshare.net/QooJuice/normal-mapping-79468987
• !!! https://blog.mastermaps.com/2013/09/creating-webgl-earth-with-threejs.html

tangent space

• https://bbtarzan12.github.io/Noraml-Mapping/

이미지

• http://planetpixelemporium.com/earth.html

• https://www.deviantart.com/fargetanik/art/Earth-Truecolor-Texture-Map-12k-819032851

• https://www.cs.cornell.edu/courses/cs4620/2020fa/assignments/shader.html

• https://sbcode.net/threejs/normalmap/

• http://www.shadedrelief.com/natural3/pages/textures.html

• https://www.artstation.com/artwork/8GXgm

• adobe: https://stock.adobe.com/kr/search?k=bump+texture&asset_id=283027187

• 벽돌 - https://polycount.com/discussion/225076/baking-tiled-materials-in-blender

• earth height map - https://asterweb.jpl.nasa.gov/images/GDEM-10km-BW.png

• https://eoimages.gsfc.nasa.gov/images/imagerecords/73000/73934/gebco_08_rev_elev_21600x10800.png

quadric surface

• https://people.cs.clemson.edu/~dhouse/courses/405/notes/quadrics.pdf