I've researched this quite a bit but I can't seem to find why I'm getting this error. I've ruled out the origin of the error coming from anywhere but "Transform .java:38", so I don't think I need to include that code. Line 38 is followed by 4 asterisks(*).
Error:
Exception in thread "main" java.lang.NullPointerException at com.base.engine.Transform.getProjectedTransformation(Transform.java:38) at com.base.engine.Game.render(Game.java:67) at com.base.engine.MainComponent.render(MainComponent.java:111) at com.base.engine.MainComponent.run(MainComponent.java:102) at com.base.engine.MainComponent.start(MainComponent.java:28) at com.base.engine.MainComponent.main(MainComponent.java:126) Code:
package com.base.engine; public class Transform { private static Camera camera; private static float zNear; private static float zFar; private static float width; private static float height; private static float fov; private Vector3f translation; private Vector3f rotation; private Vector3f scale; public Transform() { translation = new Vector3f(0,0,0); rotation = new Vector3f(0,0,0); scale = new Vector3f(1,1,1); } public Matrix4f getTransformation() { Matrix4f translationMatrix = new Matrix4f().initTranslation(translation.getX(), translation.getY(), translation.getZ()); Matrix4f rotationMatrix = new Matrix4f().initRotation(rotation.getX(), rotation.getY(), rotation.getZ()); Matrix4f scaleMatrix = new Matrix4f().initScale(scale.getX(), scale.getY(), scale.getZ()); return translationMatrix.mul(rotationMatrix.mul(scaleMatrix)); } public Matrix4f getProjectedTransformation() { Matrix4f transformationMatrix = getTransformation(); Matrix4f projectionMatrix = new Matrix4f().initProjection(fov, width, height, zNear, zFar); Matrix4f cameraRotation = new Matrix4f().initCamera(camera.getForward(), camera.getUp()); ****Matrix4f cameraTranslation = new Matrix4f().initTranslation(-camera.getPos().getX(), -camera.getPos().getY(), -camera.getPos().getZ()); return projectionMatrix.mul(cameraRotation.mul(cameraTranslation.mul(transformationMatrix))); } public Vector3f getTranslation() { return translation; } public static void setProjection(float fov, float width, float height, float zNear, float zFar) { Transform.fov = fov; Transform.width = width; Transform.height = height; Transform.zNear = zNear; Transform.zFar = zFar; } public void setTranslation(Vector3f translation) { this.translation = translation; } public void setTranslation(float x, float y, float z) { this.translation = new Vector3f(x, y, z); } public Vector3f getRotation() { return rotation; } public void setRotation(Vector3f rotation) { this.rotation = rotation; } public void setRotation(float x, float y, float z) { this.rotation = new Vector3f(x, y, z); } public Vector3f getScale() { return scale; } public void setScale(Vector3f scale) { this.scale = scale; } public void setScale(float x, float y, float z) { this.scale = new Vector3f(x, y, z); } public static Camera getCamera() { return camera; } public static void setCamera(Camera camera) { Transform.camera = camera; } } More Code:
package com.base.engine; public class Camera { public static final Vector3f yAxis = new Vector3f(0,1,0); private Vector3f pos; private Vector3f forward; private Vector3f up; public Camera() { this(new Vector3f(0,0,0), new Vector3f(0,0,1), new Vector3f(0,1,0)); } public Camera(Vector3f ps, Vector3f forward, Vector3f up) { this.pos = pos; this.forward = forward; this.up = up; up.normalize(); forward.normalize(); } public void move(Vector3f dir, float amt) { pos = pos.add(dir.mul(amt)); } public void rotateY(float angle) { Vector3f Haxis = yAxis.cross(forward); Haxis.normalize(); forward.rotate(angle, yAxis); forward.normalize(); up = forward.cross(Haxis); up.normalize(); } public void rotateX(float angle) { Vector3f Haxis = yAxis.cross(forward); Haxis.normalize(); forward.rotate(angle, Haxis); forward.normalize(); up = forward.cross(Haxis); up.normalize(); } public Vector3f getLeft() { Vector3f left = up.cross(forward); left.normalize(); return left; } public Vector3f getRight() { Vector3f right = forward.cross(up); right.normalize(); return right; } public Vector3f getPos() { return pos; } public void setPos(Vector3f pos) { this.pos = pos; } public Vector3f getForward() { return forward; } public void setForward(Vector3f forward) { this.forward = forward; } public Vector3f getUp() { return up; } public void setUp(Vector3f up) { this.up = up; } } 
camerainitialized?initTranslation?cameramight not be initialized.camerawould be null, shouldn't it throw the error on the previous line?camera.getPos()might be returning null.