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deleted 1609 characters in body
Source Link
Nebulous Ryan
Nebulous Ryan
  • 13
  • 4

edit for comments:

float points[] = {
  -10.0f,  10.0f, -10.0f,
  -10.0f, -10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
   10.0f,  10.0f, -10.0f,
  -10.0f,  10.0f, -10.0f,
  
  -10.0f, -10.0f,  10.0f,
  -10.0f, -10.0f, -10.0f,
  -10.0f,  10.0f, -10.0f,
  -10.0f,  10.0f, -10.0f,
  -10.0f,  10.0f,  10.0f,
  -10.0f, -10.0f,  10.0f,
  
   10.0f, -10.0f, -10.0f,
   10.0f, -10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
   
  -10.0f, -10.0f,  10.0f,
  -10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f, -10.0f,  10.0f,
  -10.0f, -10.0f,  10.0f,
  
  -10.0f,  10.0f, -10.0f,
   10.0f,  10.0f, -10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
  -10.0f,  10.0f,  10.0f,
  -10.0f,  10.0f, -10.0f,
  
  -10.0f, -10.0f, -10.0f,
  -10.0f, -10.0f,  10.0f,
   10.0f, -10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
  -10.0f, -10.0f,  10.0f,
   10.0f, -10.0f,  10.0f
};
GLuint vbo;
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, 3 * 36 * sizeof(float), &points, GL_STATIC_DRAW);

GLuint vao;
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);

edit for comments:

float points[] = {
  -10.0f,  10.0f, -10.0f,
  -10.0f, -10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
   10.0f,  10.0f, -10.0f,
  -10.0f,  10.0f, -10.0f,
  
  -10.0f, -10.0f,  10.0f,
  -10.0f, -10.0f, -10.0f,
  -10.0f,  10.0f, -10.0f,
  -10.0f,  10.0f, -10.0f,
  -10.0f,  10.0f,  10.0f,
  -10.0f, -10.0f,  10.0f,
  
   10.0f, -10.0f, -10.0f,
   10.0f, -10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
   
  -10.0f, -10.0f,  10.0f,
  -10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f, -10.0f,  10.0f,
  -10.0f, -10.0f,  10.0f,
  
  -10.0f,  10.0f, -10.0f,
   10.0f,  10.0f, -10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
  -10.0f,  10.0f,  10.0f,
  -10.0f,  10.0f, -10.0f,
  
  -10.0f, -10.0f, -10.0f,
  -10.0f, -10.0f,  10.0f,
   10.0f, -10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
  -10.0f, -10.0f,  10.0f,
   10.0f, -10.0f,  10.0f
};
GLuint vbo;
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, 3 * 36 * sizeof(float), &points, GL_STATIC_DRAW);

GLuint vao;
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
added 1611 characters in body
Source Link
Nebulous Ryan
Nebulous Ryan
  • 13
  • 4

edit for comments:

float points[] = {
  -10.0f,  10.0f, -10.0f,
  -10.0f, -10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
   10.0f,  10.0f, -10.0f,
  -10.0f,  10.0f, -10.0f,
  
  -10.0f, -10.0f,  10.0f,
  -10.0f, -10.0f, -10.0f,
  -10.0f,  10.0f, -10.0f,
  -10.0f,  10.0f, -10.0f,
  -10.0f,  10.0f,  10.0f,
  -10.0f, -10.0f,  10.0f,
  
   10.0f, -10.0f, -10.0f,
   10.0f, -10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
   
  -10.0f, -10.0f,  10.0f,
  -10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f, -10.0f,  10.0f,
  -10.0f, -10.0f,  10.0f,
  
  -10.0f,  10.0f, -10.0f,
   10.0f,  10.0f, -10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
  -10.0f,  10.0f,  10.0f,
  -10.0f,  10.0f, -10.0f,
  
  -10.0f, -10.0f, -10.0f,
  -10.0f, -10.0f,  10.0f,
   10.0f, -10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
  -10.0f, -10.0f,  10.0f,
   10.0f, -10.0f,  10.0f
};
GLuint vbo;
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, 3 * 36 * sizeof(float), &points, GL_STATIC_DRAW);

GLuint vao;
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);

edit for comments:

float points[] = {
  -10.0f,  10.0f, -10.0f,
  -10.0f, -10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
   10.0f,  10.0f, -10.0f,
  -10.0f,  10.0f, -10.0f,
  
  -10.0f, -10.0f,  10.0f,
  -10.0f, -10.0f, -10.0f,
  -10.0f,  10.0f, -10.0f,
  -10.0f,  10.0f, -10.0f,
  -10.0f,  10.0f,  10.0f,
  -10.0f, -10.0f,  10.0f,
  
   10.0f, -10.0f, -10.0f,
   10.0f, -10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
   
  -10.0f, -10.0f,  10.0f,
  -10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f, -10.0f,  10.0f,
  -10.0f, -10.0f,  10.0f,
  
  -10.0f,  10.0f, -10.0f,
   10.0f,  10.0f, -10.0f,
   10.0f,  10.0f,  10.0f,
   10.0f,  10.0f,  10.0f,
  -10.0f,  10.0f,  10.0f,
  -10.0f,  10.0f, -10.0f,
  
  -10.0f, -10.0f, -10.0f,
  -10.0f, -10.0f,  10.0f,
   10.0f, -10.0f, -10.0f,
   10.0f, -10.0f, -10.0f,
  -10.0f, -10.0f,  10.0f,
   10.0f, -10.0f,  10.0f
};
GLuint vbo;
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, 3 * 36 * sizeof(float), &points, GL_STATIC_DRAW);

GLuint vao;
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
Source Link
Nebulous Ryan
Nebulous Ryan
  • 13
  • 4

How do I create a view matrix that does not contain the camera translation?

I'm looking at this tutorial https://capnramses.github.io/opengl/cubemaps.html about half way down the webpage, there is a description of a vertex shader

#version 400

in vec3 vp;
uniform mat4 P, V;
out vec3 texcoords;

void main() {
  texcoords = vp;
  gl_Position = P * V * vec4(vp, 1.0);
}

The P and V matrices are my camera's projection, and view matrices, respectively. The view matrix here is a special version of the camera's view matrix that does not contain the camera translation. Inside my main loop I check if the camera has moved. If so I build a very simple view matrix and update its uniform for the cube map shader. This camera only can only rotate on the Y-Axis, but you might use a quaternion to generate a matrix for a free-look camera. Remember that view matrices use negated orientations so that the scene is rotated around the camera. Of course if you are using a different maths library then you will have different matrix functions here.

I'm having difficulty figuring out how to construct this matrix in my program. How would I construct it from a projection matrix, view matrix, or camera matrix? (These are the matrices already within my program)