Need help with my lookAt function

OpenGL OpenGL: Basic Coding
1

I made a similar post a couple days ago and now I made some changes to the code and I still don’t thing my lookAt matrix is working. Please help.

EDITED!

mat4 mat4::view(vec3 cameraVector, vec3 targetPos, vec3 upVector)
	{
		mat4 result(1.0f);
		vec3 directionVector = vec3::normalize(cameraVector - targetPos);
		vec3 rightVector = vec3::normalize(vec3::cross(upVector, directionVector));
		vec3 theUpVector = vec3::normalize(vec3::cross(directionVector, upVector));
		
		result.elements[0 + 0 * 4] = rightVector.x;
		result.elements[0 + 1 * 4] = rightVector.y;
		result.elements[0 + 2 * 4] = rightVector.z;
		result.elements[1 + 0 * 4] = theUpVector.x;
		result.elements[1 + 1 * 4] = theUpVector.y;
		result.elements[1 + 2 * 4] = theUpVector.z;
		result.elements[2 + 0 * 4] = directionVector.x;
		result.elements[2 + 1 * 4] = directionVector.y;
		result.elements[2 + 2 * 4] = directionVector.z;
		result.elements[3 + 0 * 4] = cameraVector.x;
		result.elements[3 + 1 * 4] = cameraVector.y;
		result.elements[3 + 2 * 4] = cameraVector.z;

		return result;
	}
2
  1. Your matrices appear to be transposed. OpenGL (and GLM) uses column-major order, i.e. elements 0, 1, 2, and 3 are the left-hand column, not the top row.
  2. rightVector will actually point to the left; the arguments to vec3::cross() should be the other way around.

This assumes that all of the functions and operators follow the usual conventions (the ones from GLM do).

3

I’m still taking answers

4

I’m still taking answers

Please consider that in general it is better to describe which aspect of your question was not answered by a post or what you need more details on.

Take a look at gluLookAt for how the matrix is assembled.

5

[QUOTE=carsten neumann;1280648]Please consider that in general it is better to describe which aspect of your question was not answered by a post or what you need more details on.

Take a look at gluLookAt for how the matrix is assembled.[/QUOTE]

Like I said I need some feedback to see if my matrix is alright just like what my title says. I don’t need any other information. I just need to see if I did the math right. I’m just a beginner so take it easy on me.

6

Please I need help I want to do some 3D Graphics! PLS!!!

7

The theUpVector should have the rightVector in there not upVector. My bad.