/*

     File: ASCSlideLighting.m

 Abstract: Performance tips when dealing with lights.

  Version: 1.1

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#import "ASCPresentationViewController.h"

#import "ASCSlideTextManager.h"

#import "ASCSlide.h"

#import "Utils.h"

@interface ASCSlideLighting : ASCSlide

@end

@implementation ASCSlideLighting {

    SCNNode *_roomNode;

}

- (NSUInteger)numberOfSteps {

    return 4;

}

- (void)setupSlideWithPresentationViewController:(ASCPresentationViewController *)presentationViewController {

    // Set the slide's title and subtitle and add some text

    self.textManager.title = @"Performance";

    self.textManager.subtitle = @"Lighting";

    [self.textManager addBullet:@"Minimize the number of lights" atLevel:0];

    [self.textManager addBullet:@"Prefer static than dynamic shadows" atLevel:0];

    [self.textManager addBullet:@"Use material's \"multiply\" property" atLevel:0];

}

- (void)presentStepIndex:(NSUInteger)index withPresentionViewController:(ASCPresentationViewController *)presentationViewController {

    switch (index) {

        case 1:

        {

            // Load the scene

            SCNNode *intermediateNode = [SCNNode node];

            intermediateNode.position = SCNVector3Make(0.0, 0.1, -24.5);

            intermediateNode.scale = SCNVector3Make(2.3, 1.0, 1.0);

            intermediateNode.opacity = 0.0;

            _roomNode = [intermediateNode asc_addChildNodeNamed:@"Mesh" fromSceneNamed:@"cornell-box" withScale:15];

            [self.contentNode addChildNode:intermediateNode];

            // Hide the light maps for now

            for (SCNMaterial *material in _roomNode.geometry.materials) {

                material.multiply.intensity = 0.0;

                material.lightingModelName = SCNLightingModelBlinn;

            }

            // Animate the point of view with an implicit animation.

            // On completion add to move the camera from right to left and back and forth.

            [SCNTransaction begin];

            [SCNTransaction setAnimationDuration:0.75];

            [SCNTransaction setCompletionBlock:^{

                [SCNTransaction begin];

                [SCNTransaction setAnimationDuration:2.0];

                [SCNTransaction setCompletionBlock:^{

                    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"];

                    animation.duration = 10.0;

                    animation.additive = YES;

                    animation.toValue = [NSValue valueWithSCNVector3:SCNVector3Make(-5, 0, 0)];

                    animation.fromValue = [NSValue valueWithSCNVector3:SCNVector3Make(5, 0, 0)];

                    animation.timeOffset = -animation.duration / 2;

                    animation.autoreverses = YES;

                    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

                    animation.repeatCount = FLT_MAX;

                    [presentationViewController.cameraNode addAnimation:animation forKey:@"myAnim"];

                }];

                {

                    presentationViewController.cameraHandle.position = [presentationViewController.cameraHandle convertPosition:SCNVector3Make(0, +5, -30) toNode:presentationViewController.cameraHandle.parentNode];

                    presentationViewController.cameraPitch.rotation = SCNVector4Make(1, 0, 0, -M_PI_4 * 0.2);

                }

                [SCNTransaction commit];

            }];

            {

                intermediateNode.opacity = 1.0;

            }

            [SCNTransaction commit];

            break;

        }

        case 2:

        {

            // Remove the lighting by using a constant lighing model (no lighting)

            for (SCNMaterial *material in _roomNode.geometry.materials)

                material.lightingModelName = SCNLightingModelConstant;

            break;

        }

        case 3:

        {

            // Activate the light maps smoothly

            [SCNTransaction begin];

            [SCNTransaction setAnimationDuration:1.0];

            {

                for (SCNMaterial *material in _roomNode.geometry.materials)

                    material.multiply.intensity = 1.0;

            }

            [SCNTransaction commit];

            break;

        }

    }

}

- (void)willOrderOutWithPresentionViewController:(ASCPresentationViewController *)presentationViewController {

    // Remove the animation from the camera and restore (animate) its position before leaving this slide

    [SCNTransaction begin];

    [SCNTransaction setAnimationDuration:0.0];

    {

        [presentationViewController.cameraNode removeAnimationForKey:@"myAnim"];

        presentationViewController.cameraNode.position = presentationViewController.cameraNode.presentationNode.position;

    }

    [SCNTransaction commit];

    [SCNTransaction begin];

    [SCNTransaction setAnimationDuration:1.0];

    {

        presentationViewController.cameraNode.position = SCNVector3Make(0, 0, 0);

    }

    [SCNTransaction commit];

}

@end