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.