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Download "Faster ray tracer Wi…"(4 sprites and 6 scripts) and open it in Scratch Project Notes
Removed repeat until in square root calculation to speed things up. A more finalized raytracer that renders the spheres in middle of the play field. Click the flag to move the objects around and then click it again to start the rendering process over again. This version is slower, but does a light occlusion check to cast shadows.
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wait, nevermind, i am guessing these were done is a version older than 1.2.1? i see now that 'Numbers' has a block with dropdown for all kinds of Math functions, abs, cos, sin, etc... so does that mean that a red colored block is one that isnt supported anymore, or is from an older version?
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That's correct, it's a block that is no longer supported.
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i want to know where the red 'abs' block came from?
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Canthiar, can you explain to an newbie (me) how you do this?
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If you can follow along with all of the math then you can read up on how I did it in this forum post: (link to forums)
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i dont get it ur a super genius (if i spelled right)
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...can you explain what to do? I don't get it.
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Because it doesn't use the x position to set the color. The square root is used as part of the calculation to get the length of the ray from the camera to the surface it is colliding with. It is also used to make sure that the ray used to calculate the lighting has a length of 1.
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Hey Canthiar, why does this need a square root variable? Couldn't you just tell the ray tracer something like "if x position is greater than such and such and less than such and such, set pen color to, say, blue"?
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Ray casting and ray tracing are fairly similar. If you're talking about the way Doom rendered, if I remember correctly, it only did a single cast in the vertical plane, but did a cast for each pixel on the horizontal plane. It might be possible, but I think it would still be too slow for Scratch to render in real time.
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but it has much less detail.
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Would it be possible to do a ray caster in Scratch? I don't know all the technical details, but I think ray casting is much much faster than ray tracing.
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WOWIE
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i dont get it
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I actually have a full time job writing software. You shouldn't worry about it too much and enjoy being young and having no responsibilities.
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oh wow.im not even close to having one.
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Yes, I do.
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Canthiar,you have a job?
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I guess it's just all stuff that I've had experience with at some point in the past.
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*gaping* Great programming. How'd you come up with all of this? I love it.
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It's not an interactive game. Ray tracing is a computationally intensive way of rendering graphics using 3D math.
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i dont get it...
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Yes, it does. I used to be bad at math, but I got better. Now I use it every day for my job.
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Math rocks!
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I agree.
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