Shadow on curled view about xbpagecurl

[xissburg]

This is in my todo-list. I will have to add rectangles with a semi-transparent texture so make the shadows.

[futuretap]

Awesome, thanks for the great work!

[xissburg]

I am eager to get back to work on this feature, but I am still struggling to find some spare time. You can also write some code to contribute to the project if you want ;)

[futuretap]

Unfortunately, OpenGL ES 2 with the shader language is a bit over the top of my head. But I just submitted a little fix. See pull: #34

[TroySob]

Hi,

I have another related question to the shadowing on the topside when the page is curled. How is the shadowing cast by the page curl on the topside generated? I figured out both the bottom shadow and texture shader, but I am having trouble with the top shadow generator.

I am trying to implement similar to IOS maps app. by creating a static image (pic of page slightly curled over) as the page curl drag handler, which works great but when I try to tightly crease the bottom anchor point to match the static image (see code below for bottom anchor settings)

// XBSnappingPoint _point = [[[XBSnappingPoint alloc] init] autorelease];
// point.position = CGPointMake(self.viewToCurl.frame.size.width_0.950, self.viewToCurl.frame.size.height*0.1);
// point.angle =M_PI/3;
// point.radius = 10;
// [self.pageCurlView.snappingPoints addObject:point];
// self.bottomSnappingPoint = point;

there is a load of shadowing. So when I transition from the bottom anchor point to the static image (like the IOS Maps app) its a bit in your face.

Any help or pointers in the correct direction would be great.

Cheers.....

[xissburg]

@TroySob do you have any screenshots of that? Are you using XBPageDragView? The initial angle is hardcoded.. that needs to be made easily configurable.

[futuretap]

I found that the map curl animation of Apple's Maps app not only casts a shadow on the front view (=mapView) but also dims the map view. The dimming effect is stronger the more the view is curled. Would that be easier to implement than the shadow?

[xissburg]

Yes, that is something that still have to be implemented. I've spent some time thinking about how that could be done. Initially, I thought about using a couple textured quads with gradient textures which I would distort and rotate based on the cylinder properties. That turned out to be very complex to manage.. Now I am thinking about implementing Percentage-Closer Soft Shadows (http://developer.download.nvidia.com/shaderlibrary/docs/shadow_PCSS.pdf) which will be a general solution and will also allow us to change the camera position and still have correct shadows in the scene.