Erase Color Trails Not Working


    Apr 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 ]
    }
    }
    }

    • Jun 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]
    • Jun 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.