1.《Open File》: camera_L2.wire.
2. Make the Back Surfs layer invisible.
Step1: Defining modification area
1. 《Untrim》the “Front top” surface.
2. Delete all CrvOnSrf of the “Front top” surface.
3. Set the surface’s《Patch》to “a4”. 【L2_s1-3】
4. Use《Project Normal》to project two patches line onto the surface.【L2_s1-4】
Step2: Creating new boundary curves
1.《New Curve (edit pts)》[ Knot Spacing: Uniform ; Curve Degree: 3 ]
2. Draw a curve and drag it’s ends to specific position.【L2_s2-2】
3.《Trim》the surface and “discard” the left-front area. 【L2_s2-3】
4. Draw another curve. 【L2_s2-4】
Step3: Adjusting curves
1. Select both the last CVs of the two curves and move them to “r0,0,-4. 【L2_s3-1】
2. Select both the 3ed CVs of the two curves and move them to “r0,0,-1”. 【L2_s3-2】
3. Set《Project Tangent》to the start end of the short curve with the “Front top” surface. 【L2_s3-3】
Step4: Creating a new surface
1. 《Untrim》the “Front top” surface.
2. 《Square》[ Boundary1 Continuity: Tangent ]. 【L2_s4-2】
3. Delete those two curves.
4. Set the “Front top” surface’s《Patch》to “a2” and make it template. 【L2_s4-4】
Step5: Adjusting the shape of the new surface
1.《Insert》two “isoparams” to the new surface at U0.75 and U0.62 (by using hot-key “Alt” to snap to the position). 【L2_s5-1】
2. Display CVs and Hulls. 【L2_s5-2】
3. Pick the last hull and move it to “r0,0,-3”【L2_s5-3】
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