Comments on: Picking Added

By: JOSEPH

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By: Paul Brunt

Paul Brunt — Wed, 20 Jan 2010 19:53:38 +0000

I’m not sure then to be honest; I can’t imagine why you would need a timer with more precision then +/-1ms, except maybe for very accurate physics but I’ve not even looked that far yet.

By: Paul Brunt

Paul Brunt — Wed, 20 Jan 2010 19:44:50 +0000

Thanks Steve looks like i missed some “.0″ in the shader, I think I’ve got them all now.

By: horace

horace — Wed, 20 Jan 2010 19:26:27 +0000

but aren’t milliseconds often too inaccurate? all 3d engines i know use higher precision timers.

By: Steve Elbows

Steve Elbows — Wed, 20 Jan 2010 18:12:35 +0000

Using a nightly build of webkit on OS X with WebGL enabled, I get errors with this demo such as:

ERROR: 0:55: ‘>’ : wrong operand types no operation ‘>’ exists that takes a left-hand operand of type ‘float’ and a right operand of type ‘const int’ (or there is no acceptable conversion)

By: Paul Brunt

Paul Brunt — Wed, 20 Jan 2010 18:06:56 +0000

webgl doesn’t have anything specific build in for timing but you can just used the setTimeout/Interval. This allows you to set how often you want a frame rendered without blocking the browser. If you need to know the time taken to render a frame you can just get the time using getTime on the date object before and after the frame to work out the time taken.

By: horace

horace — Wed, 20 Jan 2010 16:39:26 +0000

i have more questions…

how does timing work with webgl? for 3d applications it’s important to know exactly how long the last frame took for rendering. does javascript provide any useful info about this?

and isn’t the main loop of a webgl application like a endless loop which totally blocks the rest of the browser?

By: gero3

gero3 — Mon, 18 Jan 2010 16:26:25 +0000

and in minefield

By: gero3

gero3 — Mon, 18 Jan 2010 16:26:06 +0000

very good
works very well in chromium
only a bit slow becuase of gl.readpixels