Month: November 2018

simage
COIN3D simage library (http://www.coin3d.org/lib/simage)

• • COIN3D simage가 제공하는 이미지 포멧은 JPEG, PNG, GIF, TIFF, RGB, PIC, TGA, EPS등 다양하다.
  • COIN3D의 simage library를 사용하려면, 프로젝트에 additional library and include directory를 추가해야한다. 기존 include 와 lib 디렉토리 안에 simage.h 과 simage1d.lib를 복사한다.
  • 그리고, 텍스쳐 이미지 로딩을 위해 프로젝트에 simage1.lib 라이브러리를 링크한다.

GLSL built-in variables gl_Vertex, gl_Normal, gl_MultiTexCoord0 (version 130 까지만 지원)

GLSL Tutorial

https://www.opengl.org/sdk/docs/tutorials/TyphoonLabs/Chapter_3.pdf

Light & Material를 사용하여 glutTeapot, glutSolidSphere, glutSolidCylinder를 Shading

lab12-ShadedGLUT

Light & Material & Texture를 사용하여 glutTeapot, gluSphere, gluCylinder를 Shading

lab12-TextureShadedGLUT

ShadedGeometry with Multiple Lights & Material

• Directional Light
• Point Light
• Spot Light (‘l’ & ‘k’-key to move a spot light position)

lab11-GeometryPositionNormalMultipleLights3 (SimpleCar, SimpleSolar, SimpleRobot, SimpleMobile, SimpleCube3d, SimpleTree)

lab11-GeometryPositionNormal

ShadedGeometry-PerVertexLighting

lab11-GeometryPositionNormalPerVertexLighting
http://en.wikibooks.org/wiki/GLSL_Programming/GLUT/Diffuse_Reflection
http://en.wikibooks.org/wiki/GLSL_Programming/GLUT/Specular_Highlights

 

ShadedGeometry-PerPixelLighting

lab11-GeometryPositionNormalPerPixelLighting
http://en.wikibooks.org/wiki/GLSL_Programming/GLUT/Smooth_Specular_Highlights 

ShadedTeapotCylinderSphere (with moving light source)
11.OpenGLShadedGLUT

ShadedTeapot (with different materials)
11.OpenGLMaterialTeapot

Ambient/Diffuse/Specular (From left to right: diffuse; ambient; diffuse + ambient; diffuse+ambient+specular) from lighthouse3d.com

Light sources (From left to right: directional; point; and spotlights) from lighthouse3d.com

lab10
lab10-GeometryPositionColorHierachicalTransformationCamera

Z-fighting, also called stitching, is a phenomenon in 3D rendering that occurs when two or more primitives have similar values in the z-buffer.  This problem is usually caused by limited sub-pixel precision and floating point and fixed point round-off errors. https://en.wikipedia.org/wiki/Z-fighting

 

There is very high precision at the near plane, but very little precision at the far plane. If the range [-n, -f] is getting larger, it causes a depth precision problem (z-fighting); a small change of z_e around the far plane does not affect on z_n value. The distance between n and f should be short as possible to minimize the depth buffer precision problem.

http://www.songho.ca/opengl/gl_projectionmatrix.html