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[AlexMdle]

This image is a vertically scrolling background and I have a few questions about the things I want to do with it in GM:

Can I continously shift the hue, so that the coloration moves horizontally?

Is it possible to add enemy sprites that are basically just hue filters?

Is there any way to do Mode7-like things with the background, like making it bend and wobble?

[epcc]

afaik you can't do hue shifts without shaders. you can try to prerender them, though.
you can do enemies with different colors, just make the original grayscale and render each enemy with draw_sprite_color or whatever gamemaker has.
I'm not sure about mode 7 thing. gamemaker has 3d mode, but it's sketchy and idk how well it plays with the 2d stuff. It should be doable somehow.

[Fallsburg]

Well, I'm not a GM person, but it would be possible to do the hue filters without shaders using some sort of blitting method, assuming that you had access to the buffer that you were blitting to.  I think that in GM parlance it is known as a surface, but I could be wrong.

[Polly]

Can I continously shift the hue, so that the coloration moves horizontally?

For that particular effect you could probably get away with blend modes. Check out this demo.

Is there any way to do Mode7-like things with the background, like making it bend and wobble?

You can do Mode7 ( which is basically 3D ) yes .. bend & wobble sound like scanline effects though, which you could "simulate" using tessellated primitives.

[Geeze]

Bending is possible. I have made a tutorial about it.

[AlexMdle]

Where can I find it?

[Geeze]

http://forums.tigsource.com/index.php?topic=22155.0

[Polly]

Personally I'd advice against the technique Geeze proposes as it comes at a significant performance hit. Whereas a tessellation based solution is relatively cheap.


Yes, that's the fps in the corner

[thatshelby]

Thaaaaaaaaaaat's cool. Tutorial?

[Geeze]

Thaaaaaaaaaaat's cool. Tutorial?

Seconded.

Although using scanline methods might be useful for other effects such as waves.
What GM functions that tesselation method uses by the way?

[Polly]

Tutorial? It's really easy.



Simply render to a surface and then apply the surface texture to a d3d_model that has the desired deformation applied to its vertices ( not the texture coordinates ).

[AlexMdle]

Thaaaaaaaaaaat's cool. Tutorial?

Seconded.

Although using scanline methods might be useful for other effects such as waves.
What GM functions that tesselation method uses by the way?

Where can I find out more about scanline effects?

[Zaphos]

Although using scanline methods might be useful for other effects such as waves.

iirc Aquaria(?) does waves by essentially what Polly is describing -- just move the mesh vertices with in a wavy motion.