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question about bumpwaves sample

Started by Liker May 13, 2004 at 1:04 PM 0 replies 600+ views

Original Post

May 13, 2004 at 1:04 PM

everyone reading that code must meet the following formula: // tu = (0.8x + 0.5z) / z // tv = (0.8y - 0.5z) / z the only thing puzzling me is the float number 0.8. I guess that the number is used to scale the texture coordinate to get a synchronization between the inverted image and the real landscape. but how could I calculate to get the number 0.8? anyone help me?

Muhammad Haggag

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Muhammad Haggag

May 13, 2004 at 3:29 PM

quote:
Original post by Liker
everyone reading that code must meet the following formula:
// tu = (0.8x + 0.5z) / z
// tv = (0.8y - 0.5z) / z
the only thing puzzling me is the float number 0.8. I guess that the number is used to scale the texture coordinate to get a synchronization between the inverted image and the real landscape. but how could I calculate to get the number 0.8? anyone help me?

Well, what are the ranges of x,y, and z? (The sample renders a 2D quad, right? So these values are known).

I''ve not looked closely, but they can easily be "fudge" factors determined by trial and error. (i.e. not calculated)

Muhammad Haggag,
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