From 552864eb097f694435542dbe13bb6c62919ef40b Mon Sep 17 00:00:00 2001
From: Eryn Wells <eryn@erynwells.me>
Date: Fri, 23 Nov 2018 08:59:04 -0700
Subject: [PATCH] Plug in an MDLCamera in place of hard coded transforms

---
 Terrain2/Renderer.swift | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Terrain2/Renderer.swift b/Terrain2/Renderer.swift
index 9c6b17b..be987d7 100644
--- a/Terrain2/Renderer.swift
+++ b/Terrain2/Renderer.swift
@@ -48,6 +48,7 @@ class Renderer: NSObject, MTKViewDelegate {
     var projectionMatrix: matrix_float4x4 = matrix_float4x4()
     var rotation: Float = 0
 
+    var camera = MDLCamera()
     var terrain: Terrain
 
     var drawLines = true {
@@ -110,6 +111,11 @@ class Renderer: NSObject, MTKViewDelegate {
 
         super.init()
 
+        camera.nearVisibilityDistance = 0.1
+        camera.farVisibilityDistance = 100
+        camera.focalLength = 50
+        camera.look(at: float3(0), from: float3(0, 2, 8))
+
         populateLights()
         populateMaterials()
     }
@@ -211,11 +217,11 @@ class Renderer: NSObject, MTKViewDelegate {
             }
         }
 
-        geometryUniforms.pointer[0].projectionMatrix = projectionMatrix
+        geometryUniforms.pointer[0].projectionMatrix = camera.projectionMatrix
 
         let rotationAxis = float3(0, 1, 0)
         let modelMatrix = matrix4x4_rotation(radians: rotation, axis: rotationAxis)
-        let viewMatrix = matrix4x4_translation(0.0, -2.0, -8.0)
+        let viewMatrix = camera.transform!.matrix.inverse
         let modelViewMatrix = simd_mul(viewMatrix, modelMatrix)
         geometryUniforms.pointer[0].modelViewMatrix = modelViewMatrix
         rotation += 0.003