Forums > Jitter

Erase Color Trails Not Working

April 25, 2012 | 1:25 pm

Hello,

I’m trying to implement the background alpha trails as demonstrated in Tutorial 33 of the Jitter Tutorials (see "Erase Color and Trails" section). Though I have successfully completed the tutorial on a computer at Uni, I cannot seem to make the trails appear in either my own patch or the tutorial patch on my own system at home. I don’t quite know what I’m doing wrong, would having a 64-bit system rather than 32 have anything to do with it?

{
"Renderer" : "ATI Mobility Radeon HD 5650",
"Vendor Name" : "ATI Technologies Inc.",
"Version" : "3.2.9756 Compatibility Profile Context",
"GLSL Version" : "1.50",
"OpenGL Limits" : {
"Framebuffers" : {
"MAX_COLOR_ATTACHMENTS_EXT" : [ 8 ],
"MAX_RENDERBUFFER_SIZE_EXT" : [ 16384 ],
"MAX_VIEWPORT_DIMS" : [ 16384, 16384 ],
"MAX_DRAW_BUFFERS_ARB" : [ 8 ],
"SUBPIXEL_BITS" : [ 8 ]
}
,
"Points and Lines" : {
"ALIASED_LINE_WIDTH_RANGE" : [ 1, 128 ],
"ALIASED_POINT_SIZE_RANGE" : [ 1, 8192 ],
"SMOOTH_LINE_WIDTH_GRANULARITY" : [ 0.125 ],
"SMOOTH_LINE_WIDTH_RANGE" : [ 1, 63 ],
"SMOOTH_POINT_SIZE_GRANULARITY" : [ 0.125 ],
"SMOOTH_POINT_SIZE_RANGE" : [ 1, 63 ]
}
,
"Stacks" : {
"MAX_ATTRIB_STACK_DEPTH" : [ 16 ],
"MAX_CLIENT_ATTRIB_STACK_DEPTH" : [ 16 ],
"MAX_COLOR_MATRIX_STACK_DEPTH" : [ 0 ],
"MAX_MODELVIEW_STACK_DEPTH" : [ 32 ],
"MAX_NAME_STACK_DEPTH" : [ 64 ],
"MAX_PROGRAM_MATRIX_STACK_DEPTH_ARB" : [ 32 ],
"MAX_PROJECTION_STACK_DEPTH" : [ 10 ],
"MAX_TEXTURE_STACK_DEPTH" : [ 10 ]
}
,
"Textures" : {
"MAX_3D_TEXTURE_SIZE" : [ 8192 ],
"MAX_CUBE_MAP_TEXTURE_SIZE" : [ 16384 ],
"MAX_RECTANGLE_TEXTURE_SIZE_EXT" : [ 16384 ],
"MAX_TEXTURE_SIZE" : [ 16384 ],
"MAX_TEXTURE_LOD_BIAS" : [ 16 ],
"MAX_TEXTURE_MAX_ANISOTROPY_EXT" : [ 16 ],
"MAX_TEXTURE_UNITS" : [ 8 ]
}
,
"Shaders" : {
"MAX_COMBINED_TEXTURE_IMAGE_UNITS_ARB" : [ 32 ],
"MAX_FRAGMENT_UNIFORM_COMPONENTS_ARB" : [ 1024 ],
"MAX_TEXTURE_COORDS_ARB" : [ 16 ],
"MAX_TEXTURE_IMAGE_UNITS_ARB" : [ 16 ],
"MAX_VERTEX_ATTRIBS_ARB" : [ 16 ],
"MAX_VERTEX_TEXTURE_IMAGE_UNITS_ARB" : [ 16 ],
"MAX_VERTEX_UNIFORM_COMPONENTS_ARB" : [ 1024 ]
}

}

}



ak
June 23, 2012 | 11:28 am

Same issue here "Jitter Tutorial 33": no trails in *jit.pwindow*, no reaction to erase_color alpha channel. The problem doesn’t occur when rendering to jit.window.
[MBP, MacOS 10.7.4, AMD Radeon HD 6750M 1GB]


June 25, 2012 | 10:02 pm

hello. thanks for the report.
i can confirm jit.pwindow @erase_color alpha is not working as expected.
we’ll look into it.


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