I was drawing 2 cubes on the screen and I realized that my object behaves really weird when I changed the angle in the perspective matrix, here is my code
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glUseProgram(programID);
GLuint mvp = glGetUniformLocation(programID, "MVP");
glm::mat4 Projection = glm::perspective(45.0f, 4.0f / 3.0f, 0.1f, 10.0f);
glm::mat4 translate = glm::translate(glm::mat4(1.0f), vec3(-2.0f, 0.0f, -5.0f));
glm::mat4 rotate = glm::rotate(glm::mat4(1.0f), 54.0f, vec3(-1.0f, 0.0f, 0.0f));
glm::mat4 MVP = Projection * translate * rotate;
glUniformMatrix4fv(mvp, 1, GL_FALSE, &MVP[0][0]);
glDrawElements(GL_TRIANGLES, numOfIndices, GL_UNSIGNED_SHORT, nullptr);
translate = glm::translate(glm::mat4(1.0f), vec3(3.0f, 0.0f, -6.0f));
rotate = glm::rotate(glm::mat4(1.0f), 54.0f, vec3(0.0f, 1.0f, 0.0f));
MVP = Projection * translate * rotate;
glUniformMatrix4fv(mvp, 1, GL_FALSE, &MVP[0][0]);
glDrawElements(GL_TRIANGLES, numOfIndices, GL_UNSIGNED_SHORT, nullptr);
The 2 cubes share the same projection matrix but different translate and rotation matrix. Here is my shader
#version 430
in layout(location=0) vec3 position;
in layout(location=1) vec3 color;
uniform mat4 MVP;
out vec3 theColor;
void main(){
gl_Position = MVP * vec4(position,1.0f);
theColor = color;
}
the shader just times the MVP matrix by the position vertex. When I ran the code with 45.0f for degree in perspective matrix I got this:
and then when I ran it with 55.0f I got this:
it seems like I got behind the object and looks at them from there, and when I did 50.0f it closed up and I can only see the corner of one of the cube.
