Author Topic: Shadows appearing, disappearing and reappearing quickly  (Read 758 times)

tomreyn

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Shadows are changing shape a lot, is this how it should be?
Like, even for small objects they change shape, i.e. they appear, disappear, reappear at the same position, within just minutes of game time. That's both with projected shadows and shadow mapping here.

Since it could matter:
Code: [Select]
OpenGL vendor string: X.Org R300 Project
OpenGL renderer string: Gallium 0.4 on ATI RV560
OpenGL version string: 2.1 Mesa 7.10.2
OpenGL shading language version string: 1.20
OpenGL extensions:
    GL_ARB_copy_buffer, GL_ARB_depth_texture, GL_ARB_draw_buffers,
    GL_ARB_draw_elements_base_vertex, GL_ARB_explicit_attrib_location,
    GL_ARB_fragment_coord_conventions, GL_ARB_fragment_program,
    GL_ARB_fragment_program_shadow, GL_ARB_fragment_shader,
    GL_ARB_framebuffer_object, GL_ARB_half_float_vertex,
    GL_ARB_map_buffer_range, GL_ARB_multisample, GL_ARB_multitexture,
    GL_ARB_occlusion_query, GL_ARB_pixel_buffer_object,
    GL_ARB_point_parameters, GL_ARB_point_sprite, GL_ARB_provoking_vertex,
    GL_ARB_shader_objects, GL_ARB_shading_language_100, GL_ARB_shadow,
    GL_ARB_texture_border_clamp, GL_ARB_texture_compression,
    GL_ARB_texture_cube_map, GL_ARB_texture_env_add,
    GL_ARB_texture_env_combine, GL_ARB_texture_env_crossbar,
    GL_ARB_texture_env_dot3, GL_ARB_texture_mirrored_repeat,
    GL_ARB_texture_non_power_of_two, GL_ARB_texture_rectangle,
    GL_ARB_texture_rg, GL_ARB_texture_swizzle, GL_ARB_transpose_matrix,
    GL_ARB_vertex_array_bgra, GL_ARB_vertex_array_object,
    GL_ARB_vertex_buffer_object, GL_ARB_vertex_program, GL_ARB_vertex_shader,
    GL_ARB_window_pos, GL_EXT_abgr, GL_EXT_bgra, GL_EXT_blend_color,
    GL_EXT_blend_equation_separate, GL_EXT_blend_func_separate,
    GL_EXT_blend_logic_op, GL_EXT_blend_minmax, GL_EXT_blend_subtract,
    GL_EXT_compiled_vertex_array, GL_EXT_copy_texture,
    GL_EXT_draw_range_elements, GL_EXT_fog_coord, GL_EXT_framebuffer_blit,
    GL_EXT_framebuffer_multisample, GL_EXT_framebuffer_object,
    GL_EXT_gpu_program_parameters, GL_EXT_multi_draw_arrays,
    GL_EXT_packed_depth_stencil, GL_EXT_packed_pixels,
    GL_EXT_pixel_buffer_object, GL_EXT_point_parameters,
    GL_EXT_polygon_offset, GL_EXT_provoking_vertex, GL_EXT_rescale_normal,
    GL_EXT_secondary_color, GL_EXT_separate_shader_objects,
    GL_EXT_separate_specular_color, GL_EXT_shadow_funcs,
    GL_EXT_stencil_two_side, GL_EXT_stencil_wrap, GL_EXT_subtexture,
    GL_EXT_texture3D, GL_EXT_texture_cube_map, GL_EXT_texture_edge_clamp,
    GL_EXT_texture_env_add, GL_EXT_texture_env_combine,
    GL_EXT_texture_env_dot3, GL_EXT_texture_filter_anisotropic,
    GL_EXT_texture_lod_bias, GL_EXT_texture_mirror_clamp,
    GL_EXT_texture_object, GL_EXT_texture, GL_EXT_texture_rectangle,
    GL_EXT_texture_sRGB, GL_EXT_texture_swizzle, GL_EXT_vertex_array_bgra,
    GL_EXT_vertex_array, GL_OES_EGL_image, GL_OES_read_format,
    GL_APPLE_packed_pixels, GL_APPLE_vertex_array_object,
    GL_ATI_blend_equation_separate, GL_ATI_separate_stencil,
    GL_ATI_texture_env_combine3, GL_ATI_texture_mirror_once,
    GL_IBM_multimode_draw_arrays, GL_IBM_rasterpos_clip,
    GL_IBM_texture_mirrored_repeat, GL_INGR_blend_func_separate,
    GL_MESA_pack_invert, GL_MESA_window_pos, GL_MESA_ycbcr_texture,
    GL_NV_blend_square, GL_NV_conditional_render, GL_NV_light_max_exponent,
    GL_NV_packed_depth_stencil, GL_NV_texgen_reflection,
    GL_NV_texture_env_combine4, GL_NV_texture_rectangle,
    GL_SGIS_generate_mipmap, GL_SGIS_texture_border_clamp,
    GL_SGIS_texture_edge_clamp, GL_SGIS_texture_lod, GL_SUN_multi_draw_arrays
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Omega

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Re: Shadows appearing, disappearing and reappearing quickly
« Reply #1 on: 15 April 2011, 21:54:15 »
I seem to recall this since original Glest. It's been a problem for ad infinitum.
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