PyGameExamplesAndAnswers

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PyGame and OpenGL immediate mode (Legacy OpenGL)

Related Stack Overflow questions:

• What does “immediate mode” mean in OpenGL?

One example of “immediate mode” is using glBegin and glEnd with glVertex in between them. Another example of “immediate mode” is to use glDrawArrays with a client vertex array (i.e. not a vertex buffer object). […]

Primitive and Mesh

Related Stack Overflow questions:

• GL_LINES not showing up on top of cube?
  

  📁 OpenGL immediate mode - Draw a cube with a glBegin/glEnd sequnce and an outline
  📁 OpenGL immediate mode - Draw a cube with a glBegin/glEnd sequnce and an outline (polygon mode)

• Drawing points on a surface of a sphere
  

📁 OpenGL immediate mode - Draw points around a spherical shape

• Converting pygame 2d water ripple to pyOpenGL
  

• pygame pyopengl texture a changing polygon with many sides
  

📁 OpenGL immediate mode - 2D water particles

• X Error of failed request: BadValue (integer parameter out of range for operation), PyOpenGL
  

  📁 OpenGL immediate mode - Draw a simple triangle

  📁 OpenGL immediate mode - Draw simple triangles with polygon depth offset

• How do I add an image as texture of my 3D cube in pyopengl
  

  📁 OpenGL immediate mode - Draw a cube with texture 📁 OpenGL immediate mode - Draw a cube with texture

Examples:

📁 OpenGL immediate mode - Draw GLU object

Fixed attribute

Related Stack Overflow questions:

• PyGame OpenGL 3D Cube Lag
  

  📁 OpenGL immediate mode - Draw a cube with outline using fixed function attributes

  📁 OpenGL immediate mode - Draw a cube with outline using fixed function attributes (VAO)

  repl.it/@Rabbid76/PyGame-opengl-cube-wireframe

Draw lines and polygons

• Draw variable number of lines - PyOpenGL
  

  📁 OpenGL immediate mode - Draw contours

Wavefront .obj file

The OBJ file format is a simple data-format that represents 3D geometry.

• PyOpenGL how do I import an obj file?

• Is there a way to change the location and size of an imported .obj file in Pygame?
  

  📁 OpenGL immediate mode - Import obj (wavefront)

  repl.it/@Rabbid76/pygame-opengl-wavefront-obj

Fixed function attributes

Rendering Image in Pygame Using PyOpenGL

is there a way to render points faster OpenGL

Scale, Rotate, Translate

• PyOpenGl Pygame window freezes when run

• Drawing a cube with Pygame and OpenGL in Python environment
  

  📁 OpenGL immediate mode - Draw a wireframe cube

• How to rotate a cube using mouse in pyopengl
  

  📁 OpenGL immediate mode - rotate

• how to drag camera with the mouse like in blender
  

  📁 OpenGL immediate mode - rotate around local

• Move around cube using WASD in Pygame?
  

  📁 OpenGL immediate mode - translate object

• OpenGL python and pygame translation after rotation not working for mouselook and movement
  

  📁 OpenGL immediate mode - translate and rotate

• Moving only one cube out of 2 in Python with PyOpenGL

• PyOpenGL: move two objects separately?

  📁 OpenGL immediate mode - move objects individually

• Python OpenGL not working properly when trying to color 3D objects

• Align individual objects in pyOpenGL to create a bigger aggregated object
  

Examples:

individual object transformation

Projection

Orthographic projection

Perspective projection

confusion about glPerspective and GL_POLYGON

Strange “X” on PyOpenGL + PyGame

Camera

First person

• Stackoverflow question: how to modify the view of the camera with pygame and openGL

  📁 OpenGL immediate mode - first person 1
  📁 OpenGL immediate mode - first person 2

• How create a camera on PyOpenGL that can do “perspective rotations” on mouse movements?
  

  📁 OpenGL immediate mode - first person 3

• How to rotate a certain object (Quad) in PyOpenGL?
  How to test if a 2d point in pygame screen is part of a 3d object in PyOpenGL?
  How to do knock-backs in PyOpenGL with object facing?
  

• how to get vertical rotation in 3D space with OpenGL?
  

• how to modify the view of the camera with pygame and openGL

• Cannot draw to the same position using gluSphere()?

• Python OpenGL does not render every Triangle in a Quadrilateral

• Problems with creating a UI and glRotatef()

• Using gluLookAt() causes the objects to spin

Light

Basic OpenGL Lighting
Per Fragment Lighting

• How to correctly add a light to make object get a better view with pygame and pyopengl
  

  📁 OpenGL immediate mode - light model
  📁 OpenGL immediate mode - light model, depth range issue

• How to make specular lighting on python to implement the Phong lighting?
  

  📁 OpenGL immediate mode - Phong shading light model

Mouse position and Unproject

How to find PyGame Window Coordinates of an OpenGL Vertice?

How to test if a 2d point in pygame screen is part of a 3d object in PyOpenGL?

Hit detection

• How to find PyGame Window Coordinates of an OpenGL Vertice?

  📁 OpenGL immediate mode - hit detection 1
  📁 OpenGL immediate mode - hit detection 2

Text

• pygame + opengl = display text
  

  📁 OpenGL immediate mode - Text
  📁 OpenGL immediate mode - Text with transparent background

  replit.com/@Rabbid76/pygame-opengl-text#main.py

Compare glWindowPos and glRasterPos. While the coordinates of glRasterPos are transformed by the current modelview and projection matrices, glWindowPos directly updates the x and y coordinates of the current raster position.

Texture

• PyOpenGL texture isn’t displaying correctly
• My pygame/pyopengl code seems to apply a texture to every surface
  

• Pygame + PyOpenGL Resolution Downscaling
  

  📁 Texture - glDrawPixels
  📁 Texture - Surface to texture 📁 OpenGL immediate mode - Draw a quad with texture 📁 Texture - Retro scale texture

Shader

• Vertex/fragment shaders for a OpenGL firsrt-person shooter view?

📁 OpenGL immediate mode - immediat mode shader 1

If you use a shader program, then the matrix transformations have to be done in the vertex shader. The Legacy OpenGL matrix stack is deprecated. If you use a shader program and the legacy matrices, then you have to step back to a OpenGL Shading Language 1.20 (#version 120) shader.
In this version the built in uniforms like gl_ModelViewProjectionMatrix can be used. See Lighthouse3d.com - Hello World in GLSL.

e.g.:

# version 120
attribute vec3 a_position;
attribute vec3 a_color;

varying vec3 v_color;

void main()
{
    gl_Position = gl_ModelViewProjectionMatrix * vec4(a_position, 1.0);
    v_color = a_color;
}

Video and Camera

• Draw a background video behind a 3D model in OpenGL
  

  📁 OpenGL immediate mode - Draw a quad with texture