Terrain in World Studio

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Nilium

Is your blending method based off of vertex alpha or texture splatting or a mask texture (e.g., red channel blends texture0, green channel blends texture1, and so on and so forth). Considering you're using OpenGL, you should have the option to render the terrain sets with a fragment shader for the masking option. In fact, here's a fragment program for that.

!!ARBfp1.0

ATTRIB tc = fragment.texcoord[0];
ATTRIB color = fragment.color;

TEMP l1;
TEMP l2;
TEMP l3;
TEMP l4;
TEMP blend;

TEX blend, fragment.texcoord[1], texture[0], 2D;
TEX l1, tc, texture[1], 2D;
TEX l2, tc, texture[2], 2D;
TEX l3, tc, texture[3], 2D;
TEX l4, tc, texture[4], 2D;

LRP l2, blend.x, l2, l1;
LRP l3, blend.y, l3, l2;
LRP result.color, blend.z, l4, l3;

END;

No guarantee it works as I've just had it in my collection of shaders for ages. I really should test it in RenderMonkey some time.