def velocity_circle_distort_2d(cfg): cfg.duration = 4.0 cfg.aspect_ratio = (1, 1) coords = list(equilateral_triangle_coords()) coords.append(coords[0]) pos_kf = [ ngl.AnimKeyFrameVec2(cfg.duration * i / 3.0, pos[0:2], "exp_in_out") for i, pos in enumerate(coords) ] anim = ngl.AnimatedVec2(pos_kf) velocity = ngl.VelocityVec2(anim) vert = textwrap.dedent("""\ void main() { float distort_max = 0.1; float velocity_l = length(velocity); float direction_l = length(ngl_position); vec2 normed_velocity = velocity_l == 0.0 ? vec2(0.0) : -velocity / velocity_l; vec2 normed_direction = direction_l == 0.0 ? vec2(0.0) : ngl_position.xy / direction_l; float distort = clamp(dot(normed_velocity, normed_direction) / 2.0 * distort_max, 0.0, 1.0); vec4 pos = vec4(ngl_position, 1.0) + vec4(translate, 0.0, 0.0) + vec4(-distort * velocity, 0.0, 0.0); ngl_out_pos = ngl_projection_matrix * ngl_modelview_matrix * pos; } """) geom = ngl.Circle(radius=0.2, npoints=128) prog = ngl.Program(vertex=vert, fragment=cfg.get_frag("color")) shape = ngl.Render(geom, prog) shape.update_frag_resources(color=ngl.UniformVec3(COLORS.white), opacity=ngl.UniformFloat(1)) shape.update_vert_resources(velocity=velocity, translate=anim) return shape
def velocity_triangle_rotate(cfg): cfg.duration = 5.0 cfg.aspect_ratio = (1, 1) anim_kf = [ ngl.AnimKeyFrameFloat(0, 0), ngl.AnimKeyFrameFloat(cfg.duration, 360 * 3, "circular_in_out"), ] anim = ngl.AnimatedFloat(anim_kf) velocity = ngl.VelocityFloat(anim) frag = textwrap.dedent("""\ void main() { float v = clamp(velocity / 3000., 0.0, 1.0); ngl_out_color = vec4(v, v / 2.0, 0.0, 1.0); } """) p0, p1, p2 = equilateral_triangle_coords(2.0) triangle = ngl.RenderColor(COLORS.white, geometry=ngl.Triangle(p0, p1, p2)) triangle = ngl.Rotate(triangle, angle=anim) prog_c = ngl.Program(vertex=cfg.get_vert("color"), fragment=frag) circle = ngl.Render(ngl.Circle(radius=1.0, npoints=128), prog_c) circle.update_frag_resources(velocity=velocity) return ngl.Group(children=(circle, triangle))
def triangle(cfg, size=4 / 3): """Rotating triangle with edge coloring specified in a vertex attribute""" cfg.duration = 3.0 cfg.aspect_ratio = (1, 1) colors_data = array.array("f", [0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 0.0]) colors_buffer = ngl.BufferVec3(data=colors_data) p0, p1, p2 = equilateral_triangle_coords(size) triangle = ngl.Triangle(p0, p1, p2) p = ngl.Program(fragment=cfg.get_frag("color"), vertex=cfg.get_vert("triangle")) p.update_vert_out_vars(color=ngl.IOVec3()) node = ngl.Render(triangle, p) node.update_attributes(edge_color=colors_buffer) node.update_frag_resources(opacity=ngl.UniformFloat(1)) animkf = [ ngl.AnimKeyFrameFloat(0, 0), ngl.AnimKeyFrameFloat(cfg.duration / 3.0, -360 / 3.0, "exp_in_out"), ngl.AnimKeyFrameFloat(2 * cfg.duration / 3.0, -2 * 360 / 3.0, "exp_in_out"), ngl.AnimKeyFrameFloat(cfg.duration, -360, "exp_in_out"), ] node = ngl.Rotate(node, angle=ngl.AnimatedFloat(animkf)) return node
def shape_triangles_mat4_attribute(cfg): cfg.aspect_ratio = (1, 1) p0, p1, p2 = equilateral_triangle_coords(1) geometry = ngl.Triangle(p0, p1, p2) matrices = ngl.BufferMat4(data=array.array( "f", [ # fmt: off 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, -0.5, 0.0, 0.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.5, 0.0, 0.0, 1.0, # fmt: on ], )) program = ngl.Program( vertex=TRIANGLES_MAT4_ATTRIBUTE_VERT, fragment=cfg.get_frag("color"), ) render = ngl.Render(geometry, program, nb_instances=2) render.update_instance_attributes(matrix=matrices) render.update_frag_resources(color=ngl.UniformVec3(value=COLORS.orange), opacity=ngl.UniformFloat(1)) return render
def transform_translate_animated(cfg): cfg.aspect_ratio = (1, 1) cfg.duration = 3.0 p0, p1, p2 = equilateral_triangle_coords() anim = [ ngl.AnimKeyFrameVec3(0, p0), ngl.AnimKeyFrameVec3(1 * cfg.duration / 3.0, p1), ngl.AnimKeyFrameVec3(2 * cfg.duration / 3.0, p2), ngl.AnimKeyFrameVec3(cfg.duration, p0), ] shape = _transform_shape(cfg) return ngl.Translate(shape, vector=ngl.AnimatedVec3(anim))
def shape_triangles_mat4_attribute(cfg): cfg.aspect_ratio = (1, 1) p0, p1, p2 = equilateral_triangle_coords(1) geometry = ngl.Triangle(p0, p1, p2) matrices = ngl.BufferMat4(data=array.array('f', [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, -0.5, 0.0, 0.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.5, 0.0, 0.0, 1.0, ])) program = ngl.Program( vertex=TRIANGLES_MAT4_ATTRIBUTE_VERT, fragment=cfg.get_frag('color'), ) render = ngl.Render(geometry, program, nb_instances=2) render.update_instance_attributes(matrix=matrices) render.update_uniforms(color=ngl.UniformVec4(value=COLORS['orange'])) return render
def shape_triangle_msaa(cfg, sz=1, color=COLORS.orange): cfg.aspect_ratio = (1, 1) p0, p1, p2 = equilateral_triangle_coords(sz) geometry = ngl.Triangle(p0, p1, p2) return _render_shape(geometry, color)